Hedlund Markussen , Nina, and Nils Are Øritsland. “Food Energy Requirements of the Harp Seal (Phoca Groenlandica) Population in the Barents and White Seas”. Polar Research 10, no. 2 (January 12, 1991): 603-608. Accessed March 30, 2026. https://polarresearch.net/index.php/polar/article/view/2342.