Helicoprion and Tooth Whorls in Chondrichthyes
Grogan, Eileen D., and Richard Lund. "Helicoprion and Tooth Whorls in Chondrichthyes." Joint Annual Meetings of the Amer. Soc. of Ichthyologists and Herpetologists and the Amer. Elasmobranch Soc. Portland, OR. July 1999. Conference Presentation.