[1] Univ Engn & Technol, Dept Math, Lahore, Pakistan
[2] COMSATS Univ Islamabad, Dept Math, Sahiwal, Pakistan
[3] Riphah Int Univ, Dept Math & Stat, Islamabad, Pakistan
[4] Chinese Acad Sci, LSEC, Acad Math & Syst Sci, Beijing 100049, Peoples R China
[5] Chinese Acad Sci, ICMSEC, Acad Math & Syst Sci, Beijing 100049, Peoples R China
[6] Univ Chinese Acad Sci, Sch Math Sci, Beijing 100049, Peoples R China
[7] Univ Engn & Technol Lahore, Dept Basic Sci & Humanities, Narowal Campus, Narowal, Pakistan
[8] Prince Sattam Bin Abdulaziz Univ, Coll Sci & Humanities Al Kharj, Dept Math, Al Kharj, Saudi Arabia
[9] King Khalid Univ, Coll Sci, Dept Math, Abha, Saudi Arabia
[10] Umm Al Qura Univ, Coll Appl Sci, Dept Math Sci, Mecca, Saudi Arabia