[Chen, Shu-Bo] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.
[Ramzan, Muhammad; Shahmir, Nazia] Bahria Univ, Dept Comp Sci, Islamabad 44000, Pakistan.
[Sun, Yu-Liang] Huzhou Univ, Sch Sci, Huzhou 313000, Peoples R China.
[Aly, Ayman A.] Taif Univ, Coll Engn, Dept Mech Engn, POB 11099, At Taif 21944, Saudi Arabia.
[Malik, M. Y.] King Khalid Univ, Coll Sci, Dept Math, Abha 61413, Saudi Arabia.