1. Institute for Nuclear Research, Piteşti, Campului Str, No. 1, P. O. B. 78, Postal Code 115400 – Mioveni, Arges County, Romania
2. Silver Lake, OH 44224, USA
3. High Energy Physics Department, University of Athens, Panepistimiopolis, Zografou 15784 Athens, Greece
4. Lasers, Atoms and Molecules Physics Laboratory, University of Science and Technology, Villeneuve d'Ascq, 59655, Lille, France
5. Physics Department, "Gheorghe Asachi" Technical University, Prof. Dr. Docent Dimitrie Mangeron Rd., No. 59A, 700050, Iasi, Romania