Hazard ranking of wastewater sources in a highly polluted river in northern Taiwan by using positive matrix factorization with metal elements by Pei-Yuan Hsieh, Huan-Chun Lin, Gen-Shuh Wang, Yuan-Jeng Hsu, Yi-Ju Chen, Tzu-Hui Wang, Ren-De Wang, Chun-Yu Kuo, Di-Wen Wang, Ho-Tang Liao, Chang-Fu Wu

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