	Authors	Year	Title
	Bogoslovskaya & Pavlova	1988	O razvitii ammonoidei semeistva Spirolegoceratidae. Paleontologicheskii Zhurnal, 1988 (2): 111-114, fig.1; Moskva.
	Diener	1927	Leitfossilien des marinen Perm. G.Gürich: Leitfossilien, 5: 1-84, fig.1-10, pl.1-14; Berlin (Borntraeger).