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An article on Florida Times-Union
http://www.jacksonville.com/tu-online/stories/121304/bus_17413461.shtml
An article on TuoiTre
http://www.tuoitre.com.vn/Tianyon/Index.aspx?ArticleID=24382&ChannelID=7
News Release # 6975 from American Society of Testing and Materials
http://69.7.224.88/viewnews.aspx?newsID=536
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