http://books.google.com/books?id=uHgZAAAAMAAJ&q=%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%97%E0%B8%B2%E0%B8%A3%E0%B8%B8%E0%B8%93%E0%B8%81%E0%B8%A3%E0%B8%A1%E0%B8%A1%E0%B8%8A%E0%B9%89%E0%B8%B2%E0%B8%87&dq=%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%97%E0%B8%B2%E0%B8%A3%E0%B8%B8%E0%B8%93%E0%B8%81%E0%B8%A3%E0%B8%A1%E0%B8%A1%E0%B8%8A%E0%B9%89%E0%B8%B2%E0%B8%87&hl=th&ei=KThqTP3ZMojZca2U9csB&sa=X&oi=book_result&ct=result&resnum=2&ved=0CDEQ6AEwAQ
http://www.oknation.net/blog/freeday888/2009/09/01/entry-2
http://www.oknation.net/blog/freeday888/2009/08/25/entry-1
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