Chen, J. Y. & Zou, X. P. (1984). Ordovician cephalopods from the Ordos area, China. Memoirs of Nanjing Institute of Geology and Palaeontology. 20: 33–84 [in Chinese with English abstract].
486677
Chen, J. Y. & Zou, X. P.
1984
Ordovician cephalopods from the Ordos area, China
Memoirs of Nanjing Institute of Geology and Palaeontology