	Authors	Year	Title
	Bogoslovsky	1972	Novye rannedevonskie golovonogie Novoy Zemli. Paleontologicheskiy Zhurnal, 1972 (4): 44-51, fig.1-5, pl.5; Moskva.
	Klug	2001	Early Emsian ammonoids from the eastern Anti-Atlas (Morocco) and their succession. Paläontologische Zeitschrift, 74: 479-515, 21 figs., Stuttgart.