1. Department of Basic Sciences, Amal Jyothi College of Engineering, Kanjirappally, Kerala 686518, India
2. Research Scholar, APJ Abdul Kalam Technological University, Thiruvananthapuram, Kerala 695016, India
3. Department of Mathematics, School of Arts, Science and Humanities, SASTRA Deemed University, Tanjore, Tamil Nadu 613 401, India
4. School of Mathematics, Computer Science and Engineering Liverpool Hope University, Liverpool L169JD, UK