Samoilovitch and Mtchedlishvili, 1961
From dinoflaj3
Samoilovitch, S.R. and Mtchedlishvili, N.D.(editors), 1961: Pyltsa i spory zapadnoi Sibiri, yura-paleotsen. Vsesoyuznyi Neftyanoi Nauchno-Issledovatelskii Geologorazvedochnyi Institut, Leningrad (VNIGRI), Trudy, no.177, 352 p., 84+LXV pl.