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On the relationships of the Petalodontiformes (Chondrichthyes). Paleontological Journal, 48(9), 1015–1029
DOI: 10.1134/S0031030114090081

Grogan, E.D. & Lund, R. & Fath, M. (2014)
A New Petalodont Chondrichthyan from the Bear Gulch Limestone of Montana, USA, with Reassessment of Netsepoye hawesi and Comments on the Morphology of Holomorphic Petalodonts. Paleontological Journal, 48(9), 1003–1014
DOI: 10.1134/S0031030114090044