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*Hulley, P. A. 1970. An Investigation of the Rajidae of the West and South Coasts of Southern Africa. Ann. S. Afr. Mus., 55 (4) :151-220, fig. 1-21, pl. 1-13.

Barnard, K. H. 1923. Diagnoses of new species of marine fishes from South African waters. Ann. 5. Afr. Mus., 13: 439-445.

Bigelow, H. B.; Schroeder, W. C. 1953a. Fishes of the western North Atlantic. Sawfishes, Guitarfishes, Skates and Rays; Chimaeroids. Mem. Sears Found. Mar. Res., New Haven, 1(2): xv+588 p., 127 fig.

Hulley, P.A.; Stehmann, M. 1977. The validity of Malacoraja Stehmann,1970(Chondrichthyes, Batoidei, Rajidae) and its Phylogenetic Significiance.Ann. S. Afr. Mus., 72 (12): 227-237, 5 fig.

Krefft, G.; Lübben, C. 1966. Rala mollis Bigelow & Schroeder, 1950 (Batoidea, Elasmobranchii, Chondrichthyes) ein Erstfund im Nordostatlantik. Zool. Anz., 176 (6): 389-395, fig. 1-2.

Stehmann, M. 1970. Vergleichend morphologische und anatomische Untersuchungen zur Neuordnung der Systematik der nordostatlantischen Rajidae (Chondrichthyes, Batoidei). Arch. FischWiss., 21(2): 73-163,1 fig., pl. 1-27.

Stehmann, M. 1977. Ein neuer archibenthaler Roche aus dem Nordostatlantik, Raja kreffti spec. nov. (Elastobranchii, Batoidea, Rajidae), die zweite Spezies im Subgenus Malacoraja Stehmann, 1970.Arch. FischWiss. 28 (2/3): 77-93, fig. 1-9.

Templeman, W. 1965. Rare Skates of the Newfoundland and Neighbouring Areas. J. Fish. Res. Bd Can., 22 (2): 259-279, 13 fig., 5 tabl.

Prickled ray (Raja spinacidermis)