1. Department of Mathematics, Koneru Lakshmaiah Education Foundation, Guntur, Andhra Pradesh, India
2. University Centre for Research & Development, Department of Computer Science & Engineering, Chandigarh University, Mohali 140413, Punjab, India
3. Department of Mathematics, S. B. S. Govt. P. G. College, Rudrapur, (Udham Singh Nagar), Uttarakhand, India
4. Information Technology Department, University of Technology and Applied Sciences-Nizwa, Nizwa 611, Oman