1. Department of Mathematics and Statistics, The University of Lahore, Sargodha Campus, Lahore, Pakistan
2. Department of Mathematics, University of Education, Attock Campus, Sargodha, Pakistan
3. Department of Mathematics, COMSATS University Islamabad, Islamabad, Pakistan
4. Department of Mathematics and Statistics, Riphah International University, Islamabad, Pakistan
5. Department of Mathematics, Anurag University, Ghatkesar, Telangana, India