Bielik, M., M. Janiga, and Z. Ballová. “Spatio-Temporal Distribution of European Bison (Bison Bonasus L.) in Poloniny National Park, East Carpathians, Slovakia”. Oecologia Montana 27, no. 2 (December 31, 2018): 1-6. Accessed October 13, 2019. http://om.vuvb.uniza.sk/index.php/OM/article/view/311.