1. School of General Education and International Studies , Chongqing College of Electronic Engineering , Chongqing 401331 , China
2. College of Computer , Jiangxi University of Chinese Medicine , Nanchang , Jiangxi 330004 , China
3. Mathematics Department, Faculty of Science , Taibah University , Al-Madinah Al-Munawarah , Saudi Arabia
4. Department of Mathematics, Faculty of Science , Jiangsu University , Zhenjiang , China