Maisch, H.M. & Becker, M.A. & Griffiths, M.L. (2020)
Chondrichthyans from the Lower Clayton Limestone Unit of the Midway Group (Paleocene) near Malvern, Arkansas, USA, with comments on the K/Pg boundary.
Paläontologische Zeitschrift, 94, 561–593 DOI: 10.1007/s12542-019-00494-7