Radun, Viktor, and Mirjana Bartula. “APPLYING TECHNOLOGIES OF THE FOURTH INDUSTRIAL REVOLUTION - THE FUTURE OF ECOTOURISM AND TOURISM OF PROTECTED AREAS”. Tourism International Scientific Conference Vrnjačka Banja - TISC 7, no. 1 (October 22, 2022): 630-647. Accessed May 5, 2024. http://www.tisc.rs/proceedings/index.php/hitmc/article/view/459.