Kozyar,L.A. et al. (1962)
Palynologic evidence for the stratigraphic sequence of Maykop deposits in South Mangyshlak. [ Palinologicheskoye Obosnovaniye stratigraficheskogo Raschleneniya Maykopskikh otlozheniy Yuzhnogo Mangyslaka. ] Doklady Akademii Nauk SSSR
Vol. 144 # 4 P. 882- 885