1. Department of Mathematics, Khawaja Fareed University of Engineering and Information Technology, Rahim Yar Kahn 64200, Pakistan
2. Department of Mathematics, The Islamia University of Bahawalpur, Rahim Yar Kahn Campus, Rahim Yar Khan 64200, Pakistan
3. Department of Electric Power Systems and Management, Faculty of Electrical Engineering, Technical University of Cluj-Napoca, 400001 Cluj-Napoca, Romania
4. Department of Mathematics, College of Science, Jazan University, Jazan 45142, Saudi Arabia