1. Department of Chemistry, Faculty of Sciences, University of Craiova, 107i Calea Bucuresti, 200478 Craiova, Romania
2. Department of Physics, Faculty of Sciences, University of Craiova, 13 A. I. Cuza, 200585 Craiova, Romania
3. Faculty of Medicine, University of Medicine and Pharmacy, Petru Rares, 2, 200349 Craiova, Romania