http://deltaforce.exteen.com/20071029/entry
http://www.rmutphysics.com/charud/specialnews/spectial2/pic2/magnetic%20boat/index.htm
http://www.vcharkarn.com/vcafe/82047
http://th.wikipedia.org/wiki/%E0%B9%81%E0%B8%A1%E0%B9%88%E0%B9%80%E0%B8%AB%E0%B8%A5%E0%B9%87%E0%B8%81
http://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%AB%E0%B8%A5%E0%B9%87%E0%B8%81+
http://th.wikipedia.org/wiki/%E0%B8%96%E0%B9%88%E0%B8%B2%E0%B8%99%E0%B8%AB%E0%B8%B4%E0%B8%99
http://th.wikipedia.org/wiki/%E0%B8%9C%E0%B8%87%E0%B8%96%E0%B9%88%E0%B8%B2%E0%B8%99
http://th.wikipedia.org/wiki/%E0%B9%84%E0%B8%9F
http://th.wikipedia.org/wiki/%E0%B8%AB%E0%B8%B4%E0%B8%99
http://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%A3%E0%B8%B7%E0%B8%AD
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