Tsibizova, Ekaterina L. “The Sex and Age-Related Characteristic and the Analysis of the Natural Reasons of Death of European Bison (Bison Bonasus L.) in the Breeding Station of the Oksky Reserve”. European Bison Conservation Newsletter 2 (September 1, 2009): 73–79. Accessed April 20, 2024. http://ojs.wisent.org/index.php/czasopismo/article/view/172.