Affiliation: | aDepartment of Mathematics, Faculty of Science, Mansoura University, Mansoura, Egypt;bDepartment of Mathematics, College of Sciences and Humanities Studies in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia;cDepartment of Statistics, Quaid-i-Azam University, Islamabad, Pakistan |