Zosimovich,V.Y. (1972)
Oligocene deposits of the South-Eastern Part of the Dnieper-Donetes Depression [ Oligotsenovi vidkladi Pivdenno-Skhidnoi chastini Dniprovsko-Donetskoi Zapadini ] Tektonika i Stratigrafiya,Akademiya Nauk Ukrainskoi SSR,Institut Geologicheskikh Nauk
Vol. 1972 # 2 P. 48- 56