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untitled edit
The reference to Hall is broken. In case someone is interested, the book is "The theory of groups" by Marshall Hall, which has editions from 1959, 1968 and 1976, but not from 1969. To make things even nicer the theorem is stated with a mistake in the book (the statement in the article is correct). 46.116.70.124 (talk) 19:16, 12 September 2010 (UTC)
The reference to Hall is fixed; year of publication is fixed to 1959. It's good that the mistake in the book is mentioned at least in this talk page. SejongPARK (talk) 12:27, 30 November 2017 (UTC)