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The PPSh-41 (Russian: Пистоле́т-пулемёт Шпа́гина, tr. Pistolét-pulemyót Shpágina-41, lit. 'Shpagin's machine-pistol-41') is a Soviet submachine gun designed by Georgy Shpagin as a cheaper and simplified alternative to the PPD-40. A common Russian nickname for the weapon is "papasha" (папа́ша), meaning "daddy", and it was sometimes called the "burp gun" because of its high fire-rate.
The PPSh is a selective-fire submachine gun using an open bolt, blowback action. Made largely of stamped steel, it can be loaded with either a box or drum magazine and fires the 7.62×25mm Tokarev pistol round.
The PPSh saw extensive combat use during World War II and the Korean War; in Eastern Bloc countries, monuments celebrating the actions of the Red Army commonly feature a PPSh-41. It became one of the major infantry weapons of the Soviet Armed Forces during World War II, with about six million PPSh-41s manufactured in this period, making it the most-produced submachine gun of the war.
World War II edit
The impetus for the development of the PPSh came partly from the Winter War against Finland, where the Finnish Army employed the Suomi KP/-31 submachine gun as a highly effective tool for close-quarter fighting in forests and built-up urban areas. The PPD-34 was in mass production since 1934, but it was expensive to manufacture, both in terms of materials and labor, because it used numerous milled metal parts, particularly its receiver. Georgy Shpagin's main idea for cost reduction was to use metal stamping for the production of most parts. Shpagin created a prototype PPSh in September 1940, which also featured a simple gas compensator designed to prevent the muzzle from rising during bursts; this improved shot grouping by about 70% relative to the PPD.
The new weapon was produced in a network of factories in Moscow, with high-level local Party members made directly responsible for meeting production targets. A few hundred weapons were produced in November 1941 and another 155,000 were made during the next five months. By spring 1942, the PPSh factories were producing roughly 3,069 units a day. Soviet production figures for 1942 indicate that almost 1.5 million units were produced. Its parts (excluding the barrel) could be produced by a relatively unskilled workforce with simple equipment available in an auto repair garage or tin shop, freeing more skilled workers for other tasks. The PPSh-41 uses 87 components compared to 95 for the PPD-40 and the PPSh could be manufactured with an estimated 5.6 machining hours (later revised to 7.3 hours) compared with 13.7 hours for the PPD. Barrel production was often simplified by using barrels for the 7.62mm Mosin–Nagant: the rifle barrel was cut in half and two PPSh barrels were made from it after machining the chamber for the 7.62×25mm Tokarev cartridge.
After the German Army captured large numbers of the PPSh-41 during World War II, a program was instituted to convert the weapon to the standard German submachine gun cartridge – 9×19mm Parabellum. The Wehrmacht officially adopted the converted PPSh-41 as the "MP41(r)"; unconverted PPSh-41s were designated "MP717(r)" and supplied with 7.63×25mm Mauser ammunition. German-language manuals for the use of captured PPShs were printed and distributed in the Wehrmacht. In addition to barrel replacement, converted PPSh-41s also had a magazine adapter installed, allowing them to use MP 40 magazines. The less powerful 9mm round generally reduces the cyclic rate of fire from 800 to 750 RPM. Modern aftermarket conversion kits based on the original Wehrmacht one also exist using a variety of magazines, including Sten magazines.
As standard, each PPSh-41 came with two factory-fitted drum magazines that were matched to the weapon with marked serial numbers. If drum magazines were mixed and used with different serial numbered PPSh-41, a loose fitting could result in poor retention and failure to feed. Drum magazines were superseded by a simpler PPS-42 box-type magazine holding 35 rounds, although an improved drum magazine made from 1 mm thick steel was also introduced in 1944.
The PPS-43 was later introduced in Soviet service in 1943, which was even more basic in its design than the PPSh, and had a more moderate rate of fire, but it did not replace the PPSh-41 during the war.
The Soviet Union also experimented with the PPSh-41 in a close air support antipersonnel role, mounting 88 of the submachine guns in forward fuselage racks on the Tu-2Sh variant of the Tupolev Tu-2 bomber.
More than five million PPSh submachine guns were produced by the end of the war. The Soviets would often equip platoons and sometimes entire companies with the weapon, giving them excellent short-range firepower. Thousands more were dropped behind enemy lines in order to equip Soviet partisans to disrupt German supply lines and communications.
Korean War edit
After the Second World War, the PPSh was supplied in large quantities to Soviet-aligned states and Communist guerrilla forces. During the Korean War, the Korean People's Army (KPA) and the Chinese People's Volunteer Army (PVA) fighting in Korea received massive numbers of the PPSh-41, in addition to the North Korean Type 49 and the Chinese Type 50, which were both licensed copies of the PPSh-41 with small mechanical revisions.
Though relatively inaccurate, the Chinese PPSh has a high rate of fire and was well-suited to the close-range firefights that typically occurred, especially at night. United Nations forces in defensive outposts or on patrol often had trouble returning a sufficient volume of fire when attacked by companies of infantry armed with the PPSh. Some U.S. infantry officers ranked the PPSh as the best combat weapon of the war: while lacking the accuracy of the U.S. M1 Garand and M1 carbine, it provided more firepower at short distances. Infantry captain (later general) Hal Moore, stated: "on full automatic it sprayed a lot of bullets and most of the killing in Korea was done at very close ranges and it was done quickly – a matter of who responded faster. In situations like that it outclassed and outgunned what we had. A close-in patrol fight was over very quickly and usually we lost because of it." U.S. servicemen, however, felt that their M2 carbines were superior to the PPSh-41 at the typical engagement range of 100–150 meters.
The PPSh-41 fires the standard Soviet pistol and submachine gun cartridge, the 7.62×25mm Tokarev. Weighing approximately 12 pounds (5.45 kg) with a loaded 71-round drum and 9.5 pounds (4.32 kg) with a loaded 35-round box magazine. The PPSh is capable of a rate of about 1250 rounds per minute, a very high rate of fire in comparison to most other military submachine guns of World War II. It is a durable, low-maintenance weapon made of low-cost, easily obtained components, primarily stamped sheet metal and wood. The final production PPShs have top ejection and an L type rear sight that can be adjusted for ranges of 100 and 200 meters. A crude compensator is built into the barrel jacket, intended to reduce muzzle climb during automatic fire. The compensator was moderately successful in this respect, but it greatly increased the muzzle flash and report of the weapon. The PPSh also has a hinged receiver to facilitate field-stripping and cleaning the weapon.
A chrome-lined bore enables the PPSh to withstand both corrosive ammunition and long intervals between cleaning. No forward grip or forearm was provided, and the operator generally has to grasp the weapon behind the drum magazine with the supporting hand, or else hold the lower edge of the drum magazine. Though 35-round curved box magazines were available from 1942, the average Soviet infantryman in World War II carried the PPSh with the original 71-round drum magazine.
Although the PPSh drum magazine holds 71 rounds, misfeeding is likely to occur with more than about 65. In addition to feed issues, the drum magazine is slower and more complicated to load with ammunition than the later 35-round box magazine that increasingly supplemented the drum after 1942. While holding fewer rounds, the box magazine does have the advantage of providing a superior hold for the supporting hand. Although the PPSh is equipped with a sliding bolt safety, the weapon's open-bolt design still presents a risk of accidental discharge if the gun is dropped on a hard surface.
- Angola as of 2014[update]
- North Korea as of 1997[update]: licensed copies under the designation "Type 49"[obsolete source]
- Russian separatist forces in Donbas: Limited usage in the beginning of the war in Donbas.
- Ukraine: As of 2011, 300,000 were stored in Ministry of Defense warehouses. Some use during the 2022-23 Russian-Ukrainian War.
- Democratic Republic Of Afghanistan: Formerly in service with the Afghan Army, until the 1980s. Also used by various pro PDPA civilian militias.
- China: Made licensed copies under the designation "Type 50".
- Czechoslovakia: Used during and after World War II until succeeded by the vz. 58.
- East Germany: Used by the East German Grenztruppen der DDR and the Kampfgruppen der Arbeiterklasse This weapon became iconic especially due to its presence during the construction of the Berlin Wall being used by both the KdA and GT. Designated "MPi41" in DDR service, the PPSh-41 was gradually replaced by the AK-47 beginning in 1960.
- Estonia: Estonian partisans used captured SMGs against the Soviets in 1941.
- Finland: Used captured examples.[unreliable source?][unreliable source?]
- Georgia: Used during civil conflicts in 1990s.[unreliable source?]
- Guinea Bissau: Used by the PAIGC in the Guinea-Bissau War of Independence
- Hungary: Captured and reissued PPSh-41s in the early 1940s. Produced a local version in the early 1950s called the "7.62mm Géppisztoly 48.Minta", or simply "48m".[unreliable source?][page needed]
- Iran: In January 1943, the Iranian government and the Soviet Union signed a deal to produce the PPSh-41 in Iran under license and deliver a number of those submachine guns to the Soviet Union. Limited numbers of the PPSh-41 were produced and the production line was closed before World War Two ended. After the end of the war unknown numbers were produced and were used by Shahrbani and the military.[unreliable source?] The local version used a tangent rear sight.[page needed]
- Italian Partisans: Used examples captured from German soldiers
- Latvia: Used by Latvian partisans against Soviets in 1940s.
- Lebanese National Movement
- Malayan National Liberation Army: Used by MNLA supplied by Soviet Union only small numbers
- Nazi Germany: Used captured guns, and also converted some to 9×19mm Parabellum under the designation "MP-41(r)" and the 7.63x25mm Mauser under the designation "MP-717(r)"
- North Vietnam: Viet Minh, Viet Cong and North Vietnamese Army used PPSh-41 variants, including the K-50M license-built copy, and the Chinese Type 50.
- Poland: It was used by the First Polish Army. After the war, it was made under license as the "7.62 mm pm wz.41" by Łucznik Arms Factory.[unreliable source?]
- Romania: Captured and reissued PPSh-41 submachine guns during 1941–1944. Made licensed copies during the 1950s at Cugir Arms Plant under the designation "PM PPȘ Md. 1952".[unreliable source?]
- Sierra Leone[unreliable source?]
- South Korea: Captured from the communist forces during the Korean War. Also operated regeneration facility at the arsenal in Busan.
- Soviet Union: In service with the Soviet Army in 1942.
- Yugoslavia: Locally produced a variant known as the M49 Submachine gun.
- Type 50: A Chinese-made version of the PPSh-41. Unlike its Soviet counterpart, it only accepts column-type box magazines. Although new reports have suggested that due to various drum magazine dimensions used, some can be used while others cannot be used at all.[dead link]
- Type 49: A North Korean made version of the PPSh-41. This model only accepts drum-based magazines.
- K-50M: A Vietnamese-made submachine gun based on the Type 50s supplied by China during the Vietnam War. Produced between 1958 and 1964. The chief difference is that the cooling sleeve of the K-50 was truncated to three inches (76 mm), the front sight based on the AK-47's front sight.[unreliable source?] Modifications include the addition of a pistol grip, a steel wire-made stock and the shortened barrel.[unreliable source?] The changes resulted in a weight of 3.4 kg (7.5 lb), making K-50M lighter than the PPSh-41 by 500 g (1.1 lb).[unreliable source?] The weapon uses a 35-round stick magazine, but the 71-round drum magazine can be used if the stock is fully extended.
- MP41(r): A captured PPSh-41 converted to 9×19mm Parabellum caliber for use by German forces.
- MP717(r): A captured, unconverted PPSh-41 placed in German service and supplied with 7.63×25mm Mauser ammunition
- M-49: A Yugoslavian produced variant of the PPSh-41 design, which utilizes a round tube for the receiver and a round bolt styled after the Beretta Model 38.
- PPS-50: A semi-automatic manufactured by Pietta. A non-restricted firearm in .22LR ammunition. The box magazine holds 30 and the drum magazine holds 50. It is cosmetically similar to the PPSh-41, although the two share no other features.
- VPO-135: A semi-automatic version of the PPSh-41 from Russia.
- LDT PPSh-41: A semi-automatic-only clone of the PPSh-41. This variant with its fixed wooden stock is manufactured by Luxembourg Defence Technology for the civilian European sport shooting market.
- SKL-41: A semi-automatic version of the PPSh-41 which became available on the German market in 2008. This version is converted to fire the 9×19mm Parabellum cartridge. Aside from replicas of its original magazines, it also accepts MP 40 magazines.
- IO SR-41: A semi-automatic version of the PPSh-41 sold by American company InterOrdnance and manufactured by A. A. Arms. The barrel on this version extends past the shroud and is non-removable. Most were made of surplus PPSh parts; however, many enthusiasts criticized the gun for dubious quality.
- Additional semi-auto versions for the American market made by Wiselite and TNW. They were similar to IO SR-41, but had the shroud extend along with the barrel and were much more well received quality wise.
- Šokac : A Croatian version of the PPSH-41, produced in the 1990s for use in the Croatian War of Independence. Using a metal folding stock and a square receiver, it doesn't look like a PPSH-41 appearance wise, but mechanically the gun is a copy of the PPSH-41. The Šokac was produced because of the lack of arms the Croatians were facing, and turned to producing simple small arms to fix this issue.[unreliable source?]
- PPSh-45 : A late war variant of PPSh-41, featuring only full auto and using early PPSh-41 production tangent sights. It had a foldable stock that could also be used as a grip, and had no wood parts.
- Bishop, Chris (1998). Guns in Combat. Chartwell Books. ISBN 0-7858-0844-2.
- McNab 2014, p. 68.
- "PPSh 41 Submachine Gun : North Korean Forces". Australian War Memorial.
- McNab 2014, p. 74.
- McNab 2014, p. 73.
- de Quesada, Alejandro (10 January 2009). The Bay of Pigs: Cuba 1961. Elite 166. p. 60. ISBN 978-1-84603-323-0.
- Raeburn, Michael (1978). We Are Everywhere: Narratives from Rhodesian Guerillas. New York City: Random House. pp. 1–209. ISBN 978-0-39450-530-5.
- "Jackal Hunt One". Outpost. British South Africa Police. March 1968. Retrieved 29 March 2018 – via Rhodesia.nl.
- Howze, Hamilton H. (July 1983). "The Soviets after Afghanistan: Armaggedon in the Middle East". Army. Vol. 33, no. 7. pp. 45–50 – via Google Books.
- McNab 2014, p. 23.
- McNab 2014, p. 69.
- "PPSh41 Submachine Gun". Classic Firearms. Retrieved 29 March 2018.
- Edwards, Paul M. (2006). The Korean War. Westport, CT: Greenwood Press. p. 77. ISBN 0-313-33248-7.
- Taylor, Mike (September 2011). World War II: Weapons. Edina, MN: Abdo Publishing Company. ISBN 978-1-61478-027-4.
- Ranstadler, Robert (11 July 2017). "The Tools of War: 10 Deadly Infantry Weapons of WWII". History Collection.
- Lawrence, Erik (2015). Practical Guide to the Operational Use of the PPSh-41 Submachine Gun. Philippi, WV: Erik Lawrence Publications. p. 3. ISBN 978-1-94199-824-3.
- Budnik, Ruslan (2019). "PPSh-41 – The Most Mass-Produced Submachine Gun of WWII". War History Online.
- Болотин, Давид (1995). История советского стрелкового оружия и патронов [History of Soviet Small Arms and Ammunition] (in Russian). Полигон. pp. 109–114. ISBN 5-85503-072-5.
- Braithwaite, Rodric (2006). Moscow 1941: A City and its People at War. London, UK: Profile Books. p. 236. ISBN 978-1-86197-759-5.
- "Kalashnikov, Part 2: Soviet Political Economy and the Design Evolution of the Kalashnikov Avtomat". Cruffler.com. Retrieved 21 March 2010.
- Болотин, Давид (1995). История советского стрелкового оружия и патронов (in Russian). Полигон. pp. 111 for the early estimate vs. PPD and p. 119 comparison with PPS. ISBN 5-85503-072-5.
- Pauly, Roger (2004). Firearms: The Life Story of a Technology. Westport, CT: Greenwood Publishing Group. p. 141. ISBN 0-313-32796-3.
- "9 mm Conversion of the PPSh-41". Bill's PPSh-41 Pages. Retrieved 21 March 2010.
- "Tu-2 Gunships!". Bill's PPSh-41 Pages. Retrieved 23 November 2010.
- Bishop, Chris (2002). The Encyclopedia of Weapons of World War II. New York: MetroBooks. ISBN 978-1-58663-762-0. Retrieved 19 October 2014.
- McNab 2014, pp. 22–23.
- Halberstam, David (2007). The Coldest Winter. Hyperion Press. p. 447. ISBN 978-1-4013-0052-4.
- Thompson, Leroy (2011). The M1 Carbine. Osprey Publishing. p. 56. ISBN 978-1-84908-619-6.
- McCollum, Ian (16 December 2017). "The Iconic "Burp Gun" – Shooting the PPSh-41". Forgotten Weapons. Retrieved 11 December 2021.
The Soviet PPSh-41 submachine gun is most distinctive for its very high rate of fire – approximately 1250 rounds/minute
- "Shpagin PPSh-41 submachine gun (USSR)". WorldGuns.ru. Archived from the original on 8 March 2010. Retrieved 21 March 2010.
- Mosier, John (2003). The Blitzkrieg Myth : How Hitler and the Allies misread the strategic realities of World War II. New York City: Perennial. p. 86. ISBN 978-0-06000-977-9.
- US Department of Defense. "North Korea Country Handbook 1997, Appendix A: Equipment Recognition, PPSH 1943 SUBMACHINEGUN [sic] (TYPE-50 CHINA/MODEL-49 DPRK)" (PDF). p. A-79.
- Ferguson, Jonathan; Jenzen-Jones, N.R. (2014). "Raising Red Flags: An Examination of Arms & Munitions in the Ongoing Conflict in Ukraine. (Research Report No. 3)" (PDF). ARES. Archived from the original (PDF) on 29 June 2023. Retrieved 4 February 2015.
- "Перелік військового майна Збройних Сил, яке може бути... | від 15.08.2011 № 1022-р (Сторінка 9 з 14)". 27 September 2016. Archived from the original on 27 September 2016. Retrieved 20 March 2023.
- "Ukrainian combatant with a couple of Retro themed weapons. The fighter appears to be carrying an Beretta MG42/59 Machine gun (chambered in 7.62x51 NATO) and a Soviet PPSh-41 submachine gun". Twitter. Archived from the original on 18 July 2023. Retrieved 18 July 2023.
- "Ukrainian fighter with a PPSH-41 and a Kubelwagen". Twitter. Archived from the original on 18 July 2023. Retrieved 18 July 2023.
- Кашуба, Г. П. (1981). Афганские встречи [Afghan Meetings] (in Russian). Moskva: Izd-vo DOSAAF. p. 73.
- Афганистан сегодня: фотоальбом. / сост. Хайдар Масуд, А. Н. Сахаров. М., «Планета», 1981. стр.202-203
- Jones, Richard D.; Ness, Leland S., eds. (27 January 2009). Jane's Infantry Weapons 2009/2010 (35th ed.). Coulsdon: Jane's Information Group. ISBN 978-0-7106-2869-5.
- de Quesada, Alejandro (2014). MP 38 and MP 40 Submachine Guns. Osprey Publishing. p. 52. ISBN 978-1-78096-388-4.
- Miller, David (2001). The Illustrated Directory of 20th Century Guns. London, UK: Salamander Books Ltd. ISBN 1-84065-245-4.
- Brnardic, Vladimir (22 November 2016). World War II Croatian Legionaries: Croatian Troops Under Axis Command 1941—45. Oxford, UK: Osprey Publishing. p. 9. ISBN 978-1-4728-1767-9.
- McNab 2014, p. 50.
- Rottman, Gordon (2008). The Berlin Wall and the Intra-German Border 1961-89. Oxford, UK: Osprey Publishing. p. 44. ISBN 978-1-84603-193-9.
- Thomas, Nigel; Caballero Jurado, Carlos (25 January 2002). Germany's Eastern Front Allies (2): Baltic Forces. Men-at-Arms. Osprey Publishing. p. 41. ISBN 978-1-84176-193-0.
- "Machine Pistols, Captured and Bought". Jaeger Platoon: Finnish Army 1918-1945. Archived from the original on 21 June 2018. Retrieved 28 January 2012.
- "9 mm version of PPD-40 and PPSh-41". Bill's PPSh-41 Pages. Archived from the original on 9 February 2012. Retrieved 28 January 2012.
- Small Arms Survey (1998). Politics From The Barrel of a Gun (PDF). Cambridge University Press. p. 40. Archived from the original (PDF) on 12 January 2011.
- Keegan, John (1983). World Armies (2nd ed.). London, UK: Macmillan. p. 239. ISBN 978-0-33334-079-0.
- "7.62mm Submachine Gun PPSh41". Manowar's Hungarian Weapons & History. Archived from the original on 20 June 2023. Retrieved 21 March 2010.
- Owen, J. I. H. (1976). Warsaw Pact Infantry and its Weapons: Manportable weapons and equipment in service with the regular and reserve forces of the Soviet Union, Bulgaria, Poland, Rumania, and of Yugoslavia. London, UK: Brassey's Publishers Ltd. ISBN 978-0-90460-903-5.
- Bonn International Center for Conversion; Bundeswehr Verification Center. "MP PPSH 41". SALW Guide: Global distribution and visual identification. Retrieved 31 August 2018.
- "Iranian Submachine Guns (1941-1979)". silahreport.com. Retrieved 8 March 2023.
- Ohlson, Thomas (1988). Arms Transfer Limitations and Third World Security. Oxford University Press. p. 103. ISBN 0-19-829124-8.
- Gianluigi, Usai; Riccio, Ralph (28 January 2017). Italian partisan weapons in WWII. Schiffer Military History. p. 194. ISBN 978-0-76435-210-2.
- Vincent, Hunt (2017). Blood in the Forest: The End of the Second World War in the Courland Pocket. Warwick, UK: Helion and Company. p. 223. ISBN 978-1-912866-93-9.
- Berman, Eric G. (March 2019). Beyond Blue Helmets: Promoting Weapons and Ammunition Management in Non-UN Peace Operations (PDF). Small Arms Survey/MPOME. p. 43. Archived from the original (PDF) on 3 June 2019.
- McNab 2014, p. 22.
- McNab 2014, pp. 64–67.
- Laemlein, Tom (30 January 2018). "Guns of the Tet Offensive". American Rifleman.
- Zaloga, Steven J.; Hook, Richard (1982). The Polish Army 1939-1945. Osprey Publishing. p. 39. ISBN 0-85045-417-4.
- "About Us: Radom Before the Kalashnikov". Łucznik Arms Factory. Archived from the original on 14 December 2013. Retrieved 8 December 2013.
- "About us". Cugir Arms Plant SA. Archived from the original on 3 April 2012. Retrieved 8 December 2013.
- Infanteria Română - 180 de ani (PDF) (in Romanian). București: Editura Centrului-Tehnic Editorial al Armatei. 2010. p. 261. ISBN 978-606-524-071-1. Archived from the original (PDF) on 8 February 2015.
- "World Infantry Weapons: Sierra Leone". World Inventory. 2007–2013. Archived from the original on 24 November 2016 – via Google Sites.
- 적의 무기에서 아군 무기로!! 6.25 전장을 뒤집은 노획무기들, Republic of Korea Armed Forces Defense Media Agency, retrieved 17 September 2023
- Peterson, Philip (2011). Standard Catalog of Military Firearms: The Collector's Price and Reference Guide. Iola, WI: Gun Digest Books. p. 479. ISBN 978-1-4402-1451-6.
- Krott, Rob (2008). Save the Last Bullet for Yourself: A Soldier of Fortune in the Balkans and Somalia. Philadelphia: Casemate Publishers. p. 175. ISBN 978-1-932033-95-3.
- Iannamico, Frank (11 December 2013). "The Soviet PPSH 41 – Page 2". Small Arms Defense Journal. 5 (4).
- McCollum, Ian (27 March 2020). "North Vietnamese K-50M Submachine Gun". Forgotten Weapons.
- "K-50M Submachine Gun". Modern Firearms. Retrieved 17 January 2009.
- "VC Weapons". PTSD Junk Drawer. Retrieved 17 January 2009.
- McNab 2014, p. 59.
- Heidler, Michael (10 April 2013). "Šokac". Forgotten Weapons. Retrieved 2 June 2019.
- "Rare and Experimental Versions of Soviet PPSh Submachine Gun -". The Firearm Blog. 10 August 2017. Retrieved 9 November 2023.
- Video of PPSh being fired with box and drum magazine
- Video of PPSh being fired in burst with 9 mm conversion
- 17 photos of PPSh-41 and its parts
- Photographs of the markings present on different variations of PPSH-41 guns and their clones.
- "Rare and Experimental Versions of Soviet PPSh Submachine Gun -". The Firearm Blog. 10 August 2017. Retrieved 9 November 2023.