Helicoprion
Grogan, Eileen D.; Lund, Richard; Didier, Dominique (1999). "Description of the chimaerid jaw and its phylogenetic origins". Journal of Morphology. 239 (1): 45–59. doi:10.1002/(SICI)1097-4687(199901)239:1<45::AID-JMOR3>3.0.CO;2-S. ISSN 1097-4687. PMID 29847876. S2CID 44140851.