	Authors	Year	Title
	Wagner-Gentis	1963	Lower Namurian goniatites from the Griotte limestone of the Cantabric Mountain Chain. Not. Comm. Inst. geol. Min. Esp., 69: 5-42, pl.1-8; Madrid.
	Wagner-Gentis	1980	Goniatites from the Viséan-Namurian junction beds in Palencia, NW Spain. Scripta Geologica, 55: 1-43, fig.1-15, pl.1-8; Leiden.