Long, D. J. “First Account Oí Tbe Birdbeak Dogfish Shark, <i>Deania calcea</i≫, (Chondrichthyes: SquaUdae) from Tbe Northern Coast of Peru”. Revista De Biología Tropical, vol. 45, no. 2, June 1997, p. 937, https://revistas.ucr.ac.cr/index.php/rbt/article/view/21081.