[Khan, Muhammad Adil] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.
[Khan, Muhammad Adil] Univ Peshawar, Dept Math, Peshawar 25000, Pakistan.
[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou 3132000, Peoples R China.
[Liko, Rozana; Kashuri, Artion] Univ Ismail Qemali, Fac Tech Sci, Dept Math, Vlore, Albania.
[Ali, Gohar] Islamia Coll, Dept Math, Peshawar 25000, Pakistan.