1. Department of Geography, Tourism and Territorial Planning, Faculty of Geography, Tourism and Sport, University of Oradea, 410087 Oradea, Romania
2. Department of Physical Geography, Kyrgyz National University, 547-Frunze, Bishkek 720033, Kyrgyzstan
3. School of Resource and Environmental Science, Wuhan University, Wuhan 430072, China
4. Geography Department, Dimitrie Cantemir University, 540545 Targu Mures, Romania