Williamson, T.E. & Lucas, S.G. (1993)
Freshwater selachians from the early Palaeocene of the San Juan Basin, north-western Mexico, USA. Tertiary Research, 14(3), 97–105
Guinot, G. & Condamine, F.L. (2023)
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080