	Authors	Year	Title
	Shevyrev	1965	Nadortyad Ammonoidea. In: Ruzhentsev,V.E. & Sarycheva,T.G. (Eds.): Razvitie i smena morskikh organizmov na Rubezhe Paleozoia i Mezozoia. Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 108: 166-182, fig.9-19, pl.17-24; Moskva.
	Zakharov	1983	Novye permskie tsiklobidy (Goniatitida) yuga SSSR. (New Permian cyclolobids (Goniatitida) from the South of the ESSR). Paleontologicheskiy Zhurnal, 1983 (2): 126-130, fig.1-3; Moskva.