Škorić, Sanja, and Vladimir Jovanović. “"COVID PASSPORTS" - LEGAL ASPECT, POSSIBLE USE AND IMPACT ON TOURISM DEVELOPMENT”. Tourism International Scientific Conference Vrnjačka Banja - TISC 6, no. 1 (June 3, 2021): 484-499. Accessed April 27, 2024. http://tisc.rs/proceedings/index.php/hitmc/article/view/416.