Template:Örvig, 1960
- Ørvig, T. 1960. New finds of acanthodians, arthrodires, crossopterygians, ganoids and dipnoans in the upper Middle Devonian calcareous flags (oberer Plattenkalk) of the Bergisch Gladbach-Paffrath Trough. Paläontologische Zeitschrift 34(3): 295–335.