Sumy State University, 2 Rymskogo-Korsakova Street, 40007 Sumy, Ukraine; D. Serikbayev East Kazakhstan State Technical University, 69 Protozanova Street, 070004 Ust-Kamenogorsk, Republic of Kazakhstan; Al-Farabi Kazakh National University, 71 Al-Farabi Avenue, 050040 Almaty, Republic of Kazakhstan