1. Department of Mathematics, Rajalakshmi Engineering College, Chennai 602105, India
2. Department of Mathematics, St. Joseph’s College of Engineering, Chennai 600119, India
3. Institute of Mathematics, Khawaja Fareed University of Engineering & Information Technology, Abu Dhabi Road, Rahim Yar Khan 64200, Pakistan
4. Department of Mathematical Sciences, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates
5. PG & Research Department of Mathematics, Sanatana Dharma College, Kerala University, Kerala 688003, India