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Qiu, Xiaomin and Wu, Shuo-sheng. 2011. Global and Local Regression Analysis of Factors of American College Test (ACT) Score for Public High Schools in the State of Missouri. Annals of the Association of American Geographers, 101(1)(January), 63-83.
http://www.informaworld.com/smpp/content~db=all~content=a928636318