Affiliation: | 1.School of Mathematics and Statistics, Beijing Institute of Technology, Beijing, 100081, China ;2.Department of Mathematics, Mohi-ud-Din Islamic University, Nerian Sharif, 12010, Azad Jammu & Kashmir, Pakistan ;3.Department of Mathematics, Riphah International University, Faisalabad Campus, Satina Road, Faisalabad, Pakistan ;4.Department of Mathematics and Computer Science, Faculty of Science, Beirut Arab University, Beirut, Lebanon ;5.Department of Mathematics and Statistics, PMAS Arid Agriculture University Shamsabad, Rawalpindi, 46300, Pakistan ;6.School of Engineering, University of Portsmouth, Winston Churchill Avenue, Portsmouth, PO1 2UP, UK ;7.Department of Mathematics and Statistics, Hazara University, Mansehra, KPK, Pakistan ; |