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Guangyu Xu, Mingde Xu, Wanghai Rong and Hong Xu, “Comprehensive analysis on the quality of rural environment using GIS”, Journal of Arid Land Resources and Environment, vol. 29, no. 7, pp. 39-46, 2015.
Guangyu Xu, Guoping Chai, Mingde Xu, Fan Wang, “Application of principal component analysis in water quality evaluation of Fenhe River in Taiyuan city”, Environmental Engineering, vol. 32, no.6, pp. 122-124, 2014.