Vertebrates of the Cannonball Formation (Paleocene) in North and South Dakota. Journal of Vertebrate Paleontology, 13(1), 1–23
DOI: 10.1080/02724634.1993.10011484
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080