Miyake, T. & McEachran, J.D. & Walton, P.J. & Hall, B.K. (1992)
Development and morphology of rostral cartilages in batoid fishes (Chondrichthyes: Batoidea), with comments on homology within vertebrates.
Biological Journal of the Linnean Society, 46, 259–298 DOI: 10.1111/j.1095-8312.1992.tb00864.x