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♦ ¹Feeding ecology of sympatric European shags Phalacrocorax aristotelis and great cormorants P. carbo in Iceland, Kristjan Lilliendahl, Jon Solmundsson, Marine Biology (2006) 149: 979–990
♦ 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