1. Faculty of Chemistry, University of Belgrade, Studentski trg 16, P.O. Box 158, 11000 Belgrade, Serbia
2. Center for Chemistry ICTM, P.O. Box 473, 11000 Belgrade, Serbia
3. Chemisches Institut der Universität Potsdam, Karl-Liebknecht Strasse 24-25, D-14476 Potsdam (Golm), Germany