Pokrovskaya, 1966
From dinoflaj3
Pokrovskaya, I.M., 1966: Paleopalinologiya. Tom III. Tablitsy risunkov i mikrofotografii spor, pyltsy i drugikh rastitelnykh mikrofossilii iz otlozhenii verkhnego dokembriya-pleistotsena SSSR. Vsesoyuznyi Nauchno-Issledovatelskii Geologicheskyi Institut, Leningrad (VSEGEI), Trudy, Novaya Seryia, no.141, 367 p., pl.1-110 and III-LV.