Do pytannja pro schidnu mežu sil's'koji okrugy Ol'viji v pizn'oklasyčnyj-rann'oellinistyčnyj čas. To the problem of the eastern bounds of the Olbia Pontic's chorae in the 4th-3rd cent. B.B. - Bylkova, Valerija Pavlovna (1994)