GRC
Bailly
v. ὅτε.
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LSJ
Dor. Adv., = ὅκα, ὅτε, Alcm. 94, Cerc. 7.11, Epigr. in Berl.Sitzb. 1894.908. (From ὁδκα, cf. Lesb. ὄττι from ὁδτι, etc.)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
LSJ
Dor. for ὅταν, Epich. 165, al., Sophr. 46, Ar. Ach. 762 (Megar.), IG 5(1).962.26 (Lacon.), 12(1).694.17 (Rhodes, iii BC), Archyt. Fr. 1, Theoc. 1.87, 4.21. [ὅκκα Epich. 165, Theoc. 8.68, 11.22 (ὅκκ’ Ar. l.c., ὅκχ’ Epich. 29, etc., v. κα) ; ὅκκα Theoc. 4.21, AP 6.353.4, by confusion with ὅκκα¹]
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
poet. = ὅκα ; Theocr. 8.68, 11.22 ; auch c. conj., Mel. b. Stob. Flor. 1.64 ; ὅκκαν id. ibid. 1.67.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)