[Li, Yun-Xiang] Hunan City Univ, Sch Sci, Yiyang 413000, Peoples R China.
[Farooq, Shahid; Khan, M. Ijaz] Riphah Int Univ, Dept Math & Stat, I-14, Islamabad 44000, Pakistan.
[Gowda, R. J. Punith] Davangere Univ, Dept Studies & Res Math, Davangere, Karnataka, India.
[Ali, Arfan] Shaheed Zulfikar Ali Bhutto Inst Sci & Technol SZ, Dept Management Sci, Larkana Campus, Larkana, Sindh, Pakistan.
[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.