http://www.bloggang.com/viewdiary.php?id=kruaun&month=06-2009&date=21&group=2&gblog=3
http://www.rmutphysics.com/charud/specialnews/2/scientist/scientist3/Pythagorus.html
http://th.wikipedia.org/wiki/%E0%B8%AD%E0%B8%B2%E0%B8%A3%E0%B9%8C%E0%B8%84%E0%B8%B4%E0%B8%A1%E0%B8%B4%E0%B8%94%E0%B8%B5%E0%B8%AA
http://blog.eduzones.com/dena/4115
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