“…Literature review. The methodological basis of the research is mainly composed of the works by foreign and domestic re-searchers in this fi eld, the main of which are the following: Averkina M. [1], Bazaluk O., et al [2], Chukurna О., et al [3], Jiménez J. M. and Vargas M. V. [4], Kostyshin A. and Tibilova L. [5], Wang D.-F., et al [6], Solekah A., et al [7], Vitor W., et al [8], and others.…”