1. Department of Mathematics (Applied Sciences), School of Engineering and Technology, H. N. B. Garhwal University (A Central University), Srinagar, Uttarakhand, India
2. Department of Mathematics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
3. Department of Mathematics, Maharaja Agrasen College, University of Delhi, Delhi, India
4. Civil Engineering Department, College of Engineering, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia