[1] Vel Tech Rangarajan Dr Sagunthala R&D Inst Sci & T, Sch Sci & Humanities, Dept Math, Chennai 600062, Tamil Nadu, India
[2] Princess Nourah Bint Abdulrahman Univ, Coll Sci, Dept Math Sci, POB 84428, Riyadh 11671, Saudi Arabia
[3] Manipal Univ Jaipur, Dept Math & Stat, Jaipur 303007, Rajasthan, India
[4] MLR Inst Technol, Dept Sci & Humanities, Hyderabad 500043, Telangana, India