1. School of Mathematics and Computer Sciences, Chifeng University, Chifeng 024000, China
2. Department of Mathematics, COMSATS University Islamabad, Islamabad 45550, Pakistan
3. Department of Mathematics, Government Postgraduate College Mandian, Abbottabad 22010, Pakistan
4. Department of Mathematics, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan
5. Department of Basic Sciences, Preparatory Year Deanship, King Faisal University, Al Ahsa 31982, Saudi Arabia