Lan, T, Leppälä, K, Tomlin, C, Talbot, S L, Sage, G K, Farley, S D, Shideler, R T, Bachmann, L, Wiig, Ø, Albert, V A, Salojärvi, J, Mailund, T, Drautz-Moses, D I, Schuster, S C, Herrera-Estrella, L & Lindqvist, C 2022, ' Insights into bear evolution from a Pleistocene polar bear genome ', Proceedings of the National Academy of Sciences of the United States of America, vol. 119, no. 24 . https://doi.org/10.1073/pnas.2200016119