HOGANSON, J.W. & ERICKSON, J.M. (2005)
A new species of Ischyodus (Chondrichthyes: Holocephali: Callorhynchidae) from Upper Maastrichtian shallow marine facies of the Fox Hills and Hell Creek formations, Williston Basin, North Dakota, USA. Palaeontology, 48 (4): 709–721
DOI: 10.1111/j.1475-4983.2005.00475.x