Cheng, H.-S. et al.H.-S. et al.ChengSU-CHENG PAI2018-09-102018-09-101996http://www.scopus.com/inward/record.url?eid=2-s2.0-1542470833&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/322433application/pdfapplication/pdfCooperative Study of Precision and Accuracy on the Determinations of Around-ppb Levels of Copper and Lead in Environmental Watersjournal article10.1002/jccs.1996000362-s2.0-1542470833WOS:A1996UV70900006