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♦ ¹Predator-Prey Relationships and Food Sources of the Skagerrak Deep-Water Fish Assemblage, O. A. Bergstad, Å. D. Wik and Ø. Hildre, J. Northw. Atl. Fish. Sci., Vol. 31, 2003, pp. 165-180
♦ ²Estimating prey capture rates of a planktivorous seabird, the little auk (Alle alle), using diet, diving behaviour, and energy consumption, Ann Marie Aglionby Harding, Carsten Egevang, Wojciech Walkusz, Flemming Merkel, Ste ́phane Blanc, David Grémillet, Polar Biol (2009) 32:785–796