Smelror and Lominadze, 1989
From dinoflaj3
Smelror, M. and Lominadze, T.A., 1989: Callovian dinoflagellate cysts from the Caucasus, U.S.S.R. Neues Jahrbuch fur Geologie und Palaontologie, Abhandlungen, v.178, no.2, p.147-166.