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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.
♦ ²Feeding ecology of Coregonus albula and Osmerus eperlanus in the limnetic waters of Lake Mälaren, Sweden, Thomas G. Northcote and Johan Hammar, BOREAL ENVIRONMENT RESEARCH 11: 229–246 (2006)