1. Department of Applied Mathematics and Science, National University of Science & Technology (By Merger of Caledonian College of Engineering and Oman Medical College), Muscut, Oman
2. Department of Mathematics, School of Advanced Sciences, Vellore Institute of Technology Deemed to be University, Vellore, Tamilnadu, India
3. Department of HEAS (Mathematics), Rajasthan Technical University, Kota, India
4. Department of Mathematics, Wollo University, P. O. Box: 1145, Amhara Region, Ethiopia