LSJ
α, ον, lengthd. for ἀβέλτερος, as ἡμετέρειος for ἡμέτερος, Hdn. Gr. 1.137; prob. (for -ίου) in Anaxandr. 12 (Dind.).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
= ἀβέλτερος, angef. bei Eust.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)