1. Theoretical Physics Department, Southern Federal University, 344090 Stachki av. 194, Rostov-on-Don, Russia
2. Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow region, Russia
3. Department of Physics, Southern Federal University, 344090 Zorge str. 5, Rostov-on-Don, Russia