	Authors	Year	Title
	Kullmann & Delvolvé	1985	Goniatites du Namurien des Pyrénées Occidentales Françaises. Implications stratigraphiques et paléogéographiques. Geobios, 18 (1): 47-67, fig.1-4, tab.1, pl.1-2; Lyon.
	Nikolaeva & Kullmann	1995	The Late Namurian genus Cancelloceras (Carboniferous Ammonoidea) and its distribution. Paläontologische Zeitschrift 69: 353-376, 8 figs., 1 table, Stuttgart
	Ruzhencev & Bogoslovskaya	1978	Namyurskiy etap v evolyutsii ammonodey. Pozdnenamyurskiye ammonoidei. Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 167: 1-336, fig.1-108, pl.1-44; Moskva.