Altmann G, Aleksanyan G. SUSTAINABILITY IN TOURISM: PROBLEMS AND SOME BASIC DIRECTIONS OF SUSTAINABLE TOURISM MANAGEMENT. Proc. YSU C: Geol. Geogr. Sci. [Internet]. 2016 Aug. 15 [cited 2024 Nov. 21];50(2 (240):59-67. Available from: https://journals.ysu.am/index.php/proceedings-geol-geogr/article/view/vol50_no2_2016_pp059-067