GRC
LSJ
Dor. Adv. where? Sophr. 5.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
LSJ
τό, name of the letter π, v. Π ; — later πῖ, Sch. D.T. p. 489 H., etc.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
dor. statt πῆ u. ποῦ, Ar. Ach. 860.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)