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♦ ¹Importance of trophic information, simplification and aggregation error in ecosystem models, S. J. Metcalf, J. M. Dambacher, A. J. Hobday, J. M. Lyle, Mar Ecol Prog Ser 360: 25–36, 2008
♦ 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