Kuprin, P. N.; Potapova, L. I. (1980): Organicheskoye veshchestvo pliotsen-chetvertichnykh otlozheniy Organic material of Pliocene-Quaternary deposits. Izd. Nauka, Moscow, USSR, In: Neprochnov, Yu. P. (editor), Geologicheskaya istoriya Chernogo morya po rezul'tatam glubokovodnogo bureniya The geologic history of the Black Sea from the results of deep-sea drilling, 142-148, georefid:1982-002985