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1. http://www.answers.com/topic/tax-incidence 2. http://edu.uoh.edu.cn/zlgc/sykc/sxy/zyxt/xt6.htm  3. http://www.wpri.org/Reports/Volume%2020/Vol20No5/Vo20No5p3.html 4. http://sirealestatenews.blogspot.com/2009_03_01_archive.html 5. http://www.youtube.com/watch?v=qin2rz8aKsk