1. Department of Mathematics, Kongu Arts and Science College (Autonomous), Erode 638107, India
2. Department of Mathematical Sciences, College of Science, United Arab Emirates University, Al Ain 15551, United Arab Emirates
3. Department of Mathematics, Government Arts College (Autonomous), Kumbakonam 612002, India
4. Institute of Mathematics, Khawaja Fareed University of Engineering & Information Technology, Abu Dhabi Road, Rahim Yar Khan 64200, Pakistan