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    Constructing a Method for an Evaluation Index System Based on Graph Distance Classification and Principal Component Analysis by Keyou Shi, Yong Liu, Zhijun Zhang, Qing Yu, Qiucai Zhang

    Published 2019-01-01
    “…The seepage indexes were classified into six classes using graph distance classification, which selects the representative elements, including pH, ∑α, 210Pb, 210Po, F−, and NO3−. …”
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