1. National Institute for Laser, Plasma and Radiation
Physics, 409 Atomistilor, 077125 Magurele, Romania
2. CNR-ISC, Istituto dei Sistemi Complessi, Area della Ricerca di Roma-Tor Vergata, Via del Fosso del Cavaliere 100, I-00133, Rome, Italy
3. National Institute of Materials Physics, 105 bis Atomistilor, 077125 Magurele, Romania