[Xiong, P-Y] Hunan City Univ, Sch Sci, Yiyang 413000, Peoples R China.
[Khan, M. Ijaz] Riphah Int Univ, Dept Math & Stat, I-14, Islamabad 44000, Pakistan.
[Prasannakumara, B. C.; Kumar, R. Naveen; Gowda, R. J. Punith] Davangere Univ, Davangere, Karnataka, India.
[Prasannakumara, B. C.; Kumar, R. Naveen; Gowda, R. J. Punith] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.
[Chu, Yu-Ming] Changsha Univ Sci & Technol, Hunan Prov Key Lab Math Modeling & Anal Engn, Changsha 410114, Peoples R China.