1. Statistics Department, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia + Mathematics Department, Faculty of Science, Tanta University, Egypt%SR92-01
2. University of Niš, Faculty of Sciences and Mathematics%SR13-03.09
3. Department of Statistics, Prajyoti Niketan College, Pudukkad, India%SR92-01.57
4. Department of Applied Sciences, Vidya Academy of Science and Technology, Thrissur, India%SR92-01.57