1. Department of Equation of Mathematical Physics, Faculty of Applied Mathematics and Cybernetics, Baku State University, Z. Khalilov st. 23, AZ-1148, Baku, Azerbaijan
2. Institute of Physics, Azerbaijan National Academy of Sciences, H. Javid Avenue, 131, AZ-1143, Baku, Azerbaijan
3. Institute of Applied Mathematics, Baku State University, Z. Khalilov st. 23, AZ-1148, Baku, Azerbaijan