	Authors	Year	Title
	Spinosa & Glenister	2000	Ancestral Araxoceratinae (Upper Permian Ammonoidea) from Mexico and Iran. In: Wardlaw,B.R., Grant,R.E. & Rohr,D.M.: The Guadalupian Symposium, Smithsonian Contributions to the Earth Sciences, 32, 397-406, 6 fig., Washington.