N. Tomić, A. Antić, D. Tešić, T. Đorđević, and O. Momčilović, “Canyoning and Geotourism: Assessing Geosites for Canyoning Activites in Western Serbia”, turizam, vol. 25, no. 4, Mar. 2021, doi: 10.5937/turizam25-27524.