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  • Karl von Frisch publishes "Über die 'Sprache' der Bienen. Eine tierpsychologische Untersuchung" ("On the 'language' of bees: an examination of animal psychology").[2]

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ReferencesEdit

  1. ^ Chartrand, Mark (September 1973). "A Fifty Year Anniversary of a Two Thousand Year Dream (The History of the Planetarium)". The Planetarian. International Planetarium Society. 2 (3). ISSN 0090-3213. Archived from the original on 2009-04-20. Retrieved 2009-02-26.
  2. ^ Zoologische Jahrbücher (Physiologie) 40: pp. 1–186.
  3. ^ Coster, D.; Hevesy, G. (20 January 1923). "On the Missing Element of Atomic Number 72". Nature. 111 (2777): 79. Bibcode:1923Natur.111...79C. doi:10.1038/111079a0.
  4. ^ Hevesy, G. (1925). "The Discovery and Properties of Hafnium". Chemical Reviews. 2: 1. doi:10.1021/cr60005a001.
  5. ^ Bohr, N.; Coster, D. (December 1923). "Röntgenspektren und periodisches System der Elemente". Zeitschrift für Physik A. 12 (1): 342–374. Bibcode:1923ZPhy...12..342B. doi:10.1007/BF01328104.
  6. ^ According to chemistry historian Henry M. Leicester.
  7. ^ Singh, Simon (1999). The Code Book: the Science of Secrecy from Ancient Egypt to Quantum Cryptography. London: Fourth Estate. ISBN 1-85702-879-1.
  8. ^ Zobel, O. J. (1923). "Theory and Design of Uniform and Composite Electric Wave Filters". Bell System Technical Journal. 2: 1–46. doi:10.1002/j.1538-7305.1923.tb00001.x.
  9. ^ Fastovsky, David. "Life and Death in a 70 Million-Year-Old Sand Sea". Retrieved 2011-02-14.
  10. ^ AMNH 6515. Osborn, Henry F. (1924). "Three new Theropoda, Protoceratops zone, central Mongolia". American Museum Novitates. 144: 1–12. hdl:2246/3223.