1. School of Radio Physics, Biomedical Electronics&Computer Systems, V.N. Karazin Kharkiv National University,Kharkiv,Ukraine
2. COMSATS University Islamabad, Sahiwal Campus,Department of Mathematics,Sahiwal,Pakistan
3. Kharkiv State Academy of Culture,Digital Communications and Information Studies Department,Kharkiv,Ukraine
4. Università degli Studi di Padova,Department of Mathematics,Padova,Italy