LSJ
ἡ, Heraclean Dor. for συκῆ, Tab.Heracl. 1.172; also Aeol., IG 12(2).74.7 (Mytil.); but Dor. συκέα in an Inscr. of Halaesa, ib. 14.352 i 66 (i BC).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
[ῡ], ἡ, dor. statt συκέα, Tabul.Heracl.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)