1. Research Fellow, Geographical Institute, Research Centre for Astronomy and Earth Sciences, ELKH, Budapest, Hungary
2. Post-Doctoral Researcher, Institute of Political Science and Public Administration, University of Opole, Opole, Poland
3. Research Intern, Geographical Institute, Research Centre for Astronomy and Earth Sciences, ELKH, Budapest, Hungary
4. Senior Research Fellow, Geographical Institute, Research Centre for Astronomy and Earth Sciences, ELKH, Budapest, Hungary