[1] Jiangsu Univ, Sch Math Sci, Zhenjiang 212013, Jiangsu, Peoples R China
[2] Abdul Wali Khan Univ Mardan, Dept Math, Khyber Pakhtunkhwa 23200, Pakistan
[3] VSB Tech Univ Ostrava, IT4Innovations, Ostrava, Czech Republic
[4] Lebanese Amer Univ, Dept Comp Sci & Math, Byblos, Lebanon
[5] Narasaraopeta Engn Coll, Dept Math, Narasaraopet, Andhra Pradesh, India
[6] Majmaah Univ P O, Coll Sci Zulfi, Dept Comp Sci & Informat, POB 66, Al Majmaah 11952, Saudi Arabia