Poom Kumam. 2014. Best proximity points and global optimal approximate solutions. Bangkok:King Mongkut's University of Technology Thonburi;
Poom Kumam. (2014) Best proximity points and global optimal approximate solutions (รายงานผลงานวิจัย). King Mongkut's University of Technology Thonburi:Bangkok.
Poom Kumam. Best proximity points and global optimal approximate solutions. Bangkok:King Mongkut's University of Technology Thonburi, 2014.
Poom Kumam. (2014) Best proximity points and global optimal approximate solutions (รายงานผลงานวิจัย). King Mongkut's University of Technology Thonburi:Bangkok.