	Authors	Year	Title
	Leonova, Kutygin & Shilovskii	2005	New Data on the Composition and Evolution of the Permian Superfamily Popanocerataceae (Ammonoidea). Paleontologicheskii Zhurnal, 39 (5): 20-29,5 fig.,1 pl. [Paleontological Journal, 39 (5): 476-486,5 fig.,1 pl.]