Tretiakova, Tatiana N.; Brankov, Jovana; Petrović, Marko D.; Syromiatnikova, Yulia A.; Radovanović, Milan M.; Mikhailovich Yakovlev, Aleksey (Oradea : University of Oradea, Department of Geography, Tourism and Territorial Planning, Gdansk : Gdansk University of Physical Education and Sport, Faculty of Tourism and Recreation, 2019)