1. Department of Mathematics, Salalah College of Technology, Salalah, Oman.
2. Department of Mathematics, AIR University, PAF Complex E-9, Islamabad, Pakistan.
3. Department of Mathematics, Madanapalle Institute of Technology and Science, Madanapalle, India.
4. Department of Mathematics, School of Advanced Science, Vellore Institute Technology, Vellore, India.
5. Department of Mathematics, Sir Vishveshwaraiah Institute of Science and Technology, Madanapalle, India.