1. King Fahd University of Petroleum and Minerals, Department of Mathematics and Statistics, Dhahran, Saudi Arabia
2. NITTTR (Ministry of HRD, Govt. of India), Department of Applied Sciences, Bhopal, M.P., India
3. UIT-Rajiv Gandhi Proudyogiki Vishwavidyalaya (State Technological University of M.P), Bhopal, M.P., India.