Yano, Kazunari; Stevens, John D.; Compagno, Leonard J. V. A review of the systematics of the sleeper shark genus Somniosus with redescriptions of Somniosus (Somniosus) antarcticus and Somniosus (Rhinoscymnus) longus (Squaliformes: Somniosidae). Ichthyological Research. 2004, 51 (4): 360–73. doi:10.1007/s10228-004-0244-4.