	Authors	Year	Title
	Chernov	1939	Otryad Ammonoidea. Ammonei. Atlas rukovodyashchikh form iskopaemykh faun SSSR, 6, Permskaya sistema: 160-190, fig.39-103, pl.41-45; Leningrad, Moskva.
	Stoyanov	1910	On the character of the boundary of Palaeozoic and Mesozoic near Djulfa. Zap. Imp. S.-Peterburgkogo Mineralogicheskogo Obshchestvo, nov. ser., 47: 61-135, pl.6-9; Sankt-Peterburg.