1. Geological Survey of Serbia, Rovinjska 12, 11000 Belgrade, Serbia
2. Department of Geology, University of Vienna, Josef Holaubek-Platz 2, 1090 Vienna, Austria
3. Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoseva 12, 11000 Belgrade, Serbia
4. Jaroslav Černi Water Institute, Jaroslava Černog 80, 11226 Belgrade, Serbia