Timofeev, 1960
From dinoflaj3
Timofeev, B.V., 1960: Spory i fitoplankton proterozoya i rannego paleozoya Evrazii. Mezhdunarodnyi Geologicheskii Kongress, XXI Sessia, 1960, Doklady Sovetskikh Geologov, p.172-188, pl.1-2; Nauka, Moscow, Russia.