Grytsenko V.G.

Bohdan Khmelnytsky National University of Cherkasy, Cherkasy, Ukraine

Podolyan O.M.

Bohdan Khmelnytsky National University of Cherkasy, Cherkasy, Ukraine

Gladka L.I.

Bohdan Khmelnytsky National University of Cherkasy, Cherkasy, Ukraine

Yustyk I.V.

Bohdan Khmelnytsky National University of Cherkasy, Cherkasy, Ukraine