[1] LN Gumilyov Eurasian Natl Univ, Eurasian Int Ctr Theoret Phys, Nur Sultan, Kazakhstan
[2] LN Gumilyov Eurasian Natl Univ, Dept Gen & Theoret Phys, Nur Sultan, Kazakhstan
[3] LN Gumilyov Eurasian Natl Univ, Dept Higher Math, Nur Sultan, Kazakhstan