Authors
Vladimir Radovanović
University of Niš, Faculty of Science and Mathematics, Department of Geography,, Niš, Serbia
Dejan Ž. Đorđević
dejan.djordjevic@eknfak.ni.ac.rs
University of Nis, Faculty of Economics,, Nis, Serbia
Jelena Petrović
University of Niš, Faculty of Science and Mathematics, Department of Geography,, Niš, Serbia