1. National Institute of Materials Physics; Atomistilor 405A, P.O. Box M.G. 7, Magurele 077125 Ilfov Romania
2. National Institute for Laser, Plasma and Radiation Physics; Atomistilor 409, P.O. Box M.G. 36, Magurele 077125 Ilfov Romania
3. Institute for Research and Development in Optoelectronics - INOE2000; Atomistilor 409, Magurele 077125 Ilfov Romania