1. Faculty of Chemistry, University of Belgrade, P. O. Box 158, 11001 Belgrade
2. Faculty of Chemistry, University of Belgrade, P. O. Box 158, 11001 Belgrade i Institute of Chemistry, Technology and Metallurgy, Njegoševa 12, 11000 Belgrade, Serbia and Montenegro
3. Institute of Chemistry, Technology and Metallurgy, Njegoševa 12, 11000 Belgrade, Serbia and Montenegro