1. BLTP, JINR, Dubna, Moscow Region 141980, Russia
2. Dubna State University, Dubna 141980, Russia
3. Umarov Physical Technical Institute, TAS, Dushanbe 734063, Tajikistan
4. Theoretical Physics Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
5. University Bordeaux, LOMA UMR-CNRS 5798, F-33405 Talence Cedex, France