1. Department of Physics, West University of Timisoara, Timisoara, Romania
2. Department of Physics, Craiova University, Craiova, Romania
3. Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
4. Joint Institute for Nuclear Research (International Intergovernmental Organization), Dubna, Russian Federation
5. Centre of Polymer Systems, Tomas Bata University in Zlín, Czech Republic
6. Department of Production Engineering, Faculty of Technology, Tomas Bata University in Zlín, Czech Republic
7. Faculty of Pharmacy, University of Medicine and Pharmacy Craiova, Romania