Bielik, M., M. Janiga, and Z. Ballová. 2018. “Spatio-Temporal Distribution of European Bison (Bison Bonasus L.) in Poloniny National Park, East Carpathians, Slovakia”. Oecologia Montana 27 (2), 1-6. https://om.vuvb.uniza.sk/index.php/OM/article/view/311.