1. Department of Mathematics, Riphah International University Lahore, (Lahore Campus), Lahore Pakistan
2. College of Humanities and Social Sciences, Hebei Agricultural University, Baoding, China
3. Department of Mathematics, Thapar Institute of Engineering and Technology (Deemed University), Patiala, Punjab, India
4. Department of Basic Sciences, Preparatory Year Deanship, King Faisal University, Al-Ahsa, Saudi Arabia
5. College of Economics and Management, Hebei Agricultural University, Baoding, China