2 literature references:

Author: Svetovidov, A.N.
Year: 1979
Title: Gadidae.
Source: p. 300-320. In J.C. Hureau and Th. Monod (eds.) Check-list of the fishes of the north-eastern Atlantic and of the Mediterranean (CLOFNAM). UNESCO, Paris. Vol. 1.
Author: Cohen, D.M., T. Inada, T. Iwamoto and N. Scialabba
Year: 1990
Title: FAO Species Catalogue. Vol. 10. Gadiform fishes of the world (Order Gadiformes). An annotated and illustrated catalogue of cods, hakes, grenadiers and other gadiform fishes known to date.
Source: FAO Fish. Synop. 10 (125). 442 p.