	Authors	Year	Title
	Liang	1981	Early Permian cephalopods from Northwestern Gansu and Western Nei Monggol. Acta Paleontologica Sinica, 20 (6): 485-500, fig.1-12, pl.1-3; Beijing.
	Ruzhencev	1956	Nizhnepermskiye ammonity Yuzhnogo Urala. II. Ammonity Artinskogo yarusa. Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 60: 1-275, fig.1-97, pl.1-39; Moskva.