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2. T. B. Bagenal, E. Dahm, and P. Tuunainen, 1982 : EIFAC experiments on pelagic fish stock assessment by acoustic methods in Lake Konnevesi, Finland. EIFAC Occas. Pap. 14, 16 pp.
3. E. Dahm, J. Hartmann, T. Lindem, and H. Loffler, 1985 : EIFAC experiments on pelagic fish stock assessment by acoustic methods in Lake Constance. EIFAC Occas. Pap. 15, 15 pp.
4. On the Estimation of Biological Populations