Rusaouen, M. & Pujol, J.-P. & Bocquet, J. & Veillard, A. & Borel, J.P. (1976)
Evidence of collagen in the egg capsule of the dogfish, Scyliorhinus canicula.
Comparative Biochemistry and Physiology – Part B, Comparative Biochemistry, 53(4), 539–543 DOI: 10.1016/0305-0491(76)90214-5