1. Department of Statistics, Institute of Science, Banaras Hindu University, Varanasi, India
2. Department of Mathematics, School of Basic Science and Research, Sharda University, Greater Noida, India
3. Department of Statistics, Selcuk University, Konya, Turkey
4. Department of Mathematics, College of Science, Qassim University, Buraydah, Saudi Arabia
5. Department of Mathematics, Faculty of Science, Tanta University, Tanta, Egypt
6. Department of Mathematics, Yusuf Maitama Sule University, Kano, Nigeria
7. School of Mathematics and Statistics, Central South University, Changsha, China.