Polyakov, A. S.; Kuprin, P. N.; Shcherbakov, F. A. (1981): Fiziko-mekhanicheskiye svoystva miotsen-chetvertichnykh otlozheniy Chernogo morya Physical and mechanical properties of Miocene to Quaternary deposits in the Black Sea. Ministerstvo Vysshego i Srednego Obrazovaniya, Moscow, USSR, Izvestiya Vysshikh Uchebnykh Zavedeniy. Geologiya i Razvedka, 1981 (6), 90-98, georefid:1984-020343