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♦ ¹Seasonal feeding activity and ontogenetic dietary shifts in crucian carp, Carassius carassius, Olli-Pekka Penttinen & Ismo J. Holopainen, Environmental Biology of Fishes 33: 215-221, 1992.
♦ ²Food web topology and parasites in the pelagic zone of a subarctic lake, Per-Arne Amundsen, Kevin D. Lafferty, Rune Knudsen, Raul Primicerio, Anders Klemetsen and Armand M. Kuris, Journal of Animal Ecology 2009, 78, 563–572