1. Faculty of Natural Science, Department of Chemistry, University of Novi Sad, Trg D. Obradovica 3, 21000 Novi Sad, Serbia & Montenegro
2. Institute of Inorganic Chemistry and Metallurgy of Rare Elements, University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
3. Ecole Polytechnique, Mecanique Energetique, Technopole de Chateau Gombert, 5 rue Enrico Fermi, 13453 Marseille Cedex 13, France