1. Baranov, F.I., 1948. Theory and assessment of fishing gear. Theory of Fishing with Gillnets, Chap. 7. Fish Industry Press, Moscow (Translation from Russian by Ontario Department of Lands and Forests, Maple, Ontario, 45 pp.)
2. Coull, D.A., Jermyn, A.S., Newton, A.W., Henderson, G.I., Hall, W.B., 1989. Length/weight relationships for 88 species of fish encountered in the North East Atlantic. Scott. Fisheries Research Report no. 43/89
3. Daan, N., Bromley, P.J., Hislop, J.R.G., Nieslsen, N.A., 1990. Ecology of North Sea fish. Neth. J. Sea. Res. 26(2–4) 343–386
4. Maximum likelihood with incomplete data via the E-M algorithm;Dempster;J.R. Stat. Soc.,1977
5. Feller, W., 1968. An Introduction to Probability Theory and its Applications, vol. 1, 3rd ed. Wiley, New York