	Authors	Year	Title
	Saunders & Work	1999	The Cravenoceras-Glaphyrites dilemma: Ammonoid sutures vs. shell shape in the Mid-Carboniferous. In: Rozanov,A.Yu. & Shevyrev,A.A. (eds.), Fossil cephalopods: Recent advances in their study, Ross.Akad.Nauk, Paleont.Inst.:125-137,8 figs.,1 pl.,Mosk