Robert Beekes (with the assistance of Lucien van Beek). Etymological Dictionary of Greek. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
2014-01-21, "οὐ", "εἷς"
Blažek, Václav 2010. Glottochronologic Analysis of the Greek Lexicon: Modern, Tsakonian, Old and Mycenaean Greek. Graeco-Latina Brunensia, Volume 15, Issue 1, pp. 17-35.
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