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Parts-per notationTài liệu tham khảo
WikiPedia: Parts-per notation http://www.bipm.org/en/home/ http://www.bipm.org/en/publications/si-brochure/se... http://www.bipm.org/utils/common/pdf/CCU16.pdf //doi.org/10.1351%2Fpac199567081377 http://www.iupac.org/publications/pac/1995/pdf/670... http://archive.iupap.org/commissions/interunion/iu... https://wpsites.ucalgary.ca/chem-textbook/chapter-... https://web.viu.ca/krogh/chem311/Units%20of%20Conc... https://cfpub.epa.gov/ncer_abstracts/index.cfm/fus... https://www.nist.gov/