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<ref name=zipf1935>George K. Zipf (1935): ''The Psychobiology of Language''. Houghton-Mifflin.</ref>

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<ref name=bril1959>[[Léon Brillouin]], ''La science et la théorie de l'information'', 1959, réédité en 1988, traduction anglaise rééditée en 2004</ref>

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<ref name=mana2006>{{cite conference |author1=Bill Manaris |author2=Luca Pellicoro |author3=George Pothering |author4=Harland Hodges |title=Investigating Esperanto's statistical proportions relative to other languages using neural networks and Zipf's law |url=http://www.cs.cofc.edu/~manaris/uploads/Main/IASTED2006.pdf |journal=[[Artificial Intelligence and Applications]] |date=13 February 2006 |location=Innsbruck, Austria |pages=102–108 |url-status=dead |archive-url=https://web.archive.org/web/20160305040450/http://www.cs.cofc.edu/~manaris/uploads/Main/IASTED2006.pdf |archive-date=5 March 2016 }}</ref>

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