Origin, evolution and systematics of the dwarf acanthoceratid Protacanthoceras Spath, 1923 (Cretaceous Ammonoidea)
Wright, Claud William Kennedy, W. J. (William James)
Article
1980
Bulletin of the British Museum (Natural History) Geology
34
65--107
BioStor
English
London, BM(NH),
BioStor: https://biostor.org/reference/118641