1. Department of Mathematics, North University of China, Taiyuan, Shanxi 030051, P. R. China
2. Department of Mathematics, Zhejiang Normal University, Jinhua, Zhejiang 321004, P. R. China
3. Department of Mathematics, King Abdulaziz University, Jeddah 21589, Saudi Arabia
4. Department of Mathematics and Statistics, University of South Florida, Tampa, FL 33620-5700, USA
5. School of Mathematical and Statistical Sciences, North-West University, Mafikeng Campus, Private Bag X2046, Mmabatho 2735, South Africa