1. Institute of Natural Sciences and Mathematics Ural Federal University Yekaterinburg Russia
2. Department of Physics and Chemistry “Emilio Segrè”, Group of Interdisciplinary Theoretical Physics Università degli Studi di Palermo Palermo Italy
3. Radiophysics Department Lobachevsky State University Nizhny Novgorod Russia
4. Istituto Nazionale di Fisica Nucleare Sezione di Catania Catania Italy