Lebedeva and Nikitenko, 1998
From dinoflaj3
Lebedeva, N.K. and Nikitenko, B.L., 1998: Mikrofitoplankton i mikroforaminifery opornogo razreza nizhnego mela pripolyarnogo zaural'ya (zapadnaya Sibir'). Geologiya i Geofizica, v.39, p.799-820, pl.1-3. (In Russian with English abstract.)