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♦ ¹PRELIMINARY REPORT FROM A COMPARATIVE STUDY OF THE DIET OF FOUR GADOID FISHES IN A FJORD OF WESTERN NORWAY, A.G. Vea Salvanes, International Council for the Exploration of the Sea, C.M. 1986/G: 71, Demersal Fish Committee
♦ ²Lappalainen, A., M. Rask, H. Koponen & S. Vesala, 2001. Relative abundance, diet and growth of perch (Perca fluviatilis) and roach (Rutilus rutilus) at Tvärminne, northern Baltic Sea, in 1975 and 1997: responses to eutrophication? Boreal Env. Res. 6: 107–118