1. National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor, Magurele 077125, Romania
2. Doctoral School of Physics, Faculty of Physics, University of Bucharest, 405 Atomistilor, Magurele 077125, Romania
3. Horia Hulubei National Institute of Physics and Nuclear Engineering, 30 Reactorului, Magurele 077125, Romania