	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.
	Shevyrev	1968	Triasovye ammonoidei Yuga SSSR. Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 119: 1-272, fig.1-92, pl.1-21; Moskva.
	Tozer	1969	Xenodiscacean Ammonoids and their bearing on the discrimination of the Permo-Triassic boundary. Geological Magazine, 106 (4): 348-361, tab.1-2, pl.16; Hertford.