1. Center for Chemistry, ICTM, P. O. Box 473, YU-11001 Belgrade
2. Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, PO Box 158, YU-11001 Belgrade
3. Leimgrubenweg 21,CH-4102 Binningen, Switzerland
4. Laboratoire de Chimie Physique et de Cristalographie, Université Catholique de Louvain, 1 Place Louis Pasteur, B-1348 Louvain-la-Neuve, Belgium