Proceedings of the 12th Baltic marine biologists symposium, Helsingör, Denmark, 25-30 August 1991
Björnestad, E.; Hagerman, L.; Jensen, K. (Ed.) (1992). Proceedings of the 12th Baltic marine biologists symposium, Helsingör, Denmark, 25-30 August 1991. Olsen & Olsen: Fredensborg. ISBN 87-85215-25-2.
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