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♦ 1Annual variation in diets, feeding locations and foraging behaviour of gannets in the North Sea: flexibility, consistency and constraint, K. C. Hamer, E. M. Humphreys, S. Garthe, J. Hennicke, G. Peters, D. Grémillet, R. A. Phillips, M. P. Harris, S. Wanless, Mar Ecol Prog Ser 338: 295305, 2007
♦ 2The harbour seal Phoca vitulina as a predator in the Skagerrak. Haerkoenen, T | Heide-Joergensen, M-P, Ophelia. Vol. 34, no. 3, pp. 191-207 1991