1. Department of Chemistry
2. Faculty of Science
3. University of Kragujevac
4. 34000 Kragujevac
5. Serbia
6. Institute of Molecular Genetics and Genetic Engineering
7. University of Belgrade
8. 11000 Belgrade
9. Anorganisch-Chemisches Institüt and Interdisciplinary Center for Scientific Computing
10. Heidelberg University
11. 69120 Heidelberg
12. Germany