1. Department of Engineering Mathematics, College of Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram 522302, Andhra Pradesh, India
2. Department of Mathematics and Sciences, College of Arts and Applied Sciences, Dhofar University, Salalah 211, Oman
3. Department of Mathematics, School of Advanced Sciences, Kalasalingam Academy of Research and Education, Krishnankoil 626126, Tamil Nadu, India
4. Department of Mathematics, Zhejiang Normal University, Jinhua 321004, China