↑Ishiyama R., 1952. Studies on the rays and skates belonging to the family Rajidae, found in Japan and adjacent regions. 4. A revision of three genera of Japanese rajids with descriptions of one new genus and four new species mostly occured in northern Japan. J. Shimonoseki Coll. Fish. v. 2 (núm. 2). 1-34.
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↑Raschi, W. G. & J. D. McEachran. 1991. Rhinoraja longi, a new species of skate from the outer Aleutian Islands, with comments on the status of Rhinoraja (Chondrichthyes, Rajoidei). Can. J. Zool. v. 69 (núm. 7): 1889-1903.
↑Ishiyama, R., 1952. Studies on the rays and skates belonging to the family Rajidae, found in Japan and adjacent regions. 4. A revision of three genera of Japanese rajids with descriptions of one new genus and four new species mostly occured in northern Japan. J. Shimonoseki Coll. Fish. v. 2 (núm. 2): 1-34, Pls. 1-4.
↑Gill, T. N. & C. H. Townsend. 1897. Diagnoses of new species of fishes found in Bering Sea. Proc. Biol. Soc. Wash. v. 11: 231-234.
↑Ishiyama, R., 1958. Studies on the rajid fishes (Rajidae) found in the waters around Japan. J. Shimonoseki Coll. Fish. v. 7 (núms. 2-3): 191-394, Pls. 1-3.