1. Department of General Education, Anhui Xinhua University, Hefei 230088, China
2. School of Mathematics and Physics, Anhui Jianzhu University, Hefei 230601, China
3. Department of Mathematics, Azarbaijan Shahid Madani University, Tabriz, Iran
4. Department of Mathematics, COMSATS University Islamabad, Lahore Campus, Islamabad, Pakistan
5. Department of Mathematics and Applications, Shahed University, Tehran, Iran
6. Faculty of Ocean Engineering Technology and Informatics, University Malaysia Terengganu, Kuala Nerus 21030 UMT, Terengganu, Malaysia