[1] Tianjin Polytech Univ, Dept Math, Tianjin 300160, Peoples R China
[2] COMSATS Inst Informat Technol, Dept Math, Islamabad, Pakistan
[3] King Saud Univ, Coll Sci, Dept Math, Riyadh 11451, Saudi Arabia
[4] Cheng Shiu Univ, Dept Informat Management, Kaohsiung 833, Taiwan
[5] Gyeongsang Natl Univ, Dept Math, Jinju 660701, South Korea
[6] Gyeongsang Natl Univ, RINS, Jinju 660701, South Korea