	Authors	Year	Title
	Oyens	1933	On Paralegoceras sundaicum Haniel and related forms. Proceedings of the Koninklijke Nederlandsche Akademie van Wetenschappen, 36 (1): 88-98, 5 fig.
	Oyens	1938	Preliminary note on the occurrence of a new ammonoid fauna of Permian age on the island of Timor. Proceedings of the Koninklijke Nederlandsche Akademie van Wetenschappen, 41 (10): 1122-1126.