Opršal, Zdeněk, Jaromír Harmáček, Petr Pavlík, and Ivo Machar. “What Factors Can Influence the Expansion of Protected Areas Around the World in the Context of International Environmental and Development Goals?”. Problemy Ekorozwoju 13, no. 1 (January 2, 2018): 145–157. Accessed July 22, 2024. https://ph.pollub.pl/index.php/preko/article/view/5047.