作者单位：
Mathematical Department, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt
[1]
Basic Science Department, Higher Institute of Engineering, Shorouk City, Cairo, Egypt
[2]
Mathematical Department, Faculty of Science, King AbdulAziz University, Jeddah, Saudi Arabia
[3]
发布时间
2013-11-20
换一批
