Timofeev, 1959
From dinoflaj3
Timofeev, B.V., 1959: Drevneishaya flora Pribaltiki i ee stratigraficheskoe znachenie. Vsesoyuznyi Neftyanoi Nauchno-Issledovatelskii Geologorazvedochnyi Institut, Leningrad (VNIGRI), Trudy, no.129, p.1-136, pl.1-24.