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♦ 1A quantitative comparison between diet and body fatty acid composition in wild northern pike (Esox lucius L.), Karl Schwalme, Fish Physiology and Biochemistry vol. 10 no. 2 pp 91-98 (1992)
♦ 2del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.