Hung, V., 		Thi Minh Nguyet, V., 		Van Quynh, B., & 		Tung Lam, H.
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 Application of Principal Component Analysis  in Determining the Hydrogeochemistry Characteristics  of Karst Water in Bac Kan and Cao Bang.
<em>VNU Journal Of Science: Earth And Environmental Sciences, 40</em>(2).
doi:10.25073/2588-1094/vnuees.5030