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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: 295–305, 2007
♦ ²Feeding ecology of sympatric European shags Phalacrocorax aristotelis and great cormorants P. carbo in Iceland, Kristjan Lilliendahl, Jon Solmundsson, Marine Biology (2006) 149: 979–990