1. Institute of General and Physical Chemistry, Studentski trg 12-16, YU-11000 Beograd, Yugoslavia, P.O. Box 551
2. Faculty of Science, Department of Chemistry, Radoja Domanovica 12, YU-34000 Kragujevac, Yugoslavia, P.O. Box 60
3. Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, YU-11000 Beograd, Yugoslavia, P.O. Box 137