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Andriashev, A. P. 1954. Ryby severnykh morei SSSR. Izv. Akad. Nauk SSSR. Moskwa-Leningrad. (English trans. 1964, Jerusalem, IPST, 617 pp., 300 fig.)

Bean, T. H. 1885a. Description of a new species of Plectromus (P. crassiceps) taken by the United States Fish Commission. Proc. U.S. natn. Mus., 8 (5): 73-74.

Jensen, A. S. 1942. Contribution to the ichthyofauna of Greenland 1-3. Spolia. zool. Mus. haun., 2: 7-44, 8 pl.

Jordan, D. S.; Evermann, B. W.; Clark, H. W. 1930. Check list of the fishes and fishlike vertebrates of North and Middle America north of the northern boundary of Venezuela and Columbia. Rep. U.S. Commnr Fish. for 1928, part II: 670 p. (Reprint 1962, Eric Lundberg, Ashton, Maryland).

Lütken, C. F. 1876c. Korte Bidrag til nordisk Ichthyographi. I. Foreløbige meddelelser om nordiske ulkefiske (Cottoidei). Vidensk. Meddr dansk naturh. Foren., Københ.: pp. 355-388, fig., Résumé: pp. 72-98.

Ulcina olriki