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.
[RB]
Location
2014-01-21, "πέτομαι", "πτερόν"
Source
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.
[Blažek (2010)]
Source
Buck, C., D. (1949). A dictionary of selected synonyms in the principal Indo–European languages: a contribution to the history of ideas. Chicago: University of Chicago Press.
[CDB]
Location
183
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