3 literature references:

Author: Stein, D.L.
Year: 1986
Title: Cyclopteridae.
Source: p. 1269-1274. In P.J.P. Whitehead, M.-L. Bauchot, J.-C. Hureau, J. Nielsen and E. Tortonese (eds.) Fishes of the North-eastern Atlantic and the Mediterranean. UNESCO, Paris. Vol. III.
Author: FAO-FIES
Year: 2011
Title: Aquatic Sciences and Fisheries Information System (ASFIS) species list.
Source: Retrieved from http://www.fao.org/fishery/collection/asfis/en, March 2011.
Author: Coad, B.W. and J.D. Reist
Year: 2004
Title: Annotated list of the arctic marine fishes of Canada.
Source: Can. MS Rep. Fish Aquat. Sci. 2674:iv:+112 p.