	Authors	Year	Title
	Popov	1979	Kamennougol'nye ammonoidei Donbassa i ikh stratigraficheskoe znachenie. Vsesoyuznyi ordena Lenina nauchno-issledovatel'skii geologicheskii institut, Trudy, novaia seriya, 220: 1-106, figs. 1-10, pl.1-12, Leningrad.