Authors
Volodymyr Maslyuchenko
Chernivtsi National University, Department of Mathematical Analysis, Chernivtsi, Ukraine
Oksana Myronyk
Chernivtsi National University, College CHNU, Chernivtsi, Ukraine
Olha Filipchuk
Chernivtsi National University, Department of Mathematical Problems of Control and Cybernetics, Chernivtsi, Ukraine