Malyshkina, T.P. & González-Barba, G. & Bannikov, A.F. (2013)
Records of Elasmobranchian Teeth in the Bartonian of the Northern Caucasus (Russia) and Crimea (Ukraine). Paleonotological Journal, 47(1), 98–103
DOI: 10.1134/S0031030113010085

Bazzi, M. & Campione, N.E. & Kear, B.P. & Pimiento, C. & Ahlberg, P.E. (2021)
Feeding ecology has shaped the evolution of modern sharks. Current Biology, 31(23), 5138–5148
DOI: 10.1016/j.cub.2021.09.028