1. Biryukov, N.P., Baltiiskaya treska (Baltic Cod), Kaliningrad: AtlantNIRO, 1970.
2. Nikol’skii, G.V., Chastnaya ikhtiologiya (Special Ichthyology), Moscow: Vysshaya shkola, 1971.
3. Berner, M. and Müller, H., Discrimination between “Baltic cod” (Gadus morhua callarias L.) and “Belt Sea cod” (Gadus morhua morhua) by means of morphometric and meristic characters, ICES Counc. Meet. Pap., 1989, J: 13, pp. 1–13.
4. Bleil, M. and Oeberst, R., Fecundity of Baltic cod—differences between ICES sub-divisions and variations from 1993 to 1999, ICES Mini-Symposium on Ecosystem Change in the Baltic CM, 2001, U: 01, pp. 1–19.
5. Müller, H., The distribution of “Belt Sea cod” and “Baltic cod” in the Baltic Sea from 1995 to 2001 estimated by discriminant analysis of the number of dorsal fin rays, ICES CM, 2002, L:16, pp. 1–24.