C. Valadez-González, B. Aguilar-Palomino, and S. Hernández-Vázquez, “Feeding habits of the round stingray Urobatis Halleri (Cooper, 1863) (Chondrichthyes: Urolophidae) from the continental shelf of Jalisco and Colima, Mexico”, Cienc. Mar., vol. 27, no. 1, pp. 91–104, Mar. 2001.