1. Department of Mathematics, Dong-A University, Busan 49315, Republic of Korea
2. Aitchison College, Lahore 54000, Pakistan
3. Division of Science and Technology, University of Education, Lahore 54000, Pakistan
4. Department of Mathematics, University of Management and Technology, Sialkot Campus, Sialkot 51410, Pakistan
5. Department of Mathematics and RINS, Gyeongsang National University, Jinju 52828, Republic of Korea
6. Center for General Education, China Medical University, Taichung 40402, Taiwan