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http://hi.baidu.com/youxiaoyu/item/71c4c0ed280b5db62e140bdb
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http://burningmonster.blogspot.de/2010/10/diagonals_20.html
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http://www.conceptart.org/forums/showthread.php/181436-Perspective-Tutorial
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http://kikirini.deviantart.com/art/Perspective-Tutorial-Part-1-105502618
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http://www.conceptart.org/forums/show.../181394-Point-of-View-and-Perspective
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http://www.conceptart.org/forums/showthread.php/108180-Perspective-101
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http://isites.harvard.edu/fs/docs/icb.topic121420.files/Persp_Refresher.pdf
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