Born, E. W., E. Stefansson, B. Mikkelsen, K. L. Laidre, L. W. Andersen, F. F. Rigét, M. Villum Jensen, and D. Bloch. “A note on a walrus’ European odyssey”. NAMMCO Scientific Publications, vol. 9, Feb. 2014, pp. 75-91, doi:10.7557/3.2921.