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tokens: ACKNOWLEDGEMENTS The authors acknowledge the support from the program of development of M.V. Lomonosov Moscow State University (Leading Scientific School ‘Physics of stars, relativistic objects and galaxies’). We also would like to thank the Professor Maurizio Paolillo (Department of Physics, University of Naples Federico II) and Arina Morgunova (Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University) for the useful discussion.