23-CHM-STATE OF CHANGE #PART 1-STATE OF CHANGE

http://www.neutron.rmutphysics.com/news/index.php?option=com_content&task=view&id=2690&Itemid=3

http://exercise-exam.blogspot.com/2014_05_01_archive.html

 http://www.slideshare.net/Songsak1/ss-52586228

 http://www.slideshare.net/seksan082/ss-56233000

http://www.slideshare.net/meemahidol/2-2-48873855