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WikiPedia: Số dư Nitơ //edwardbetts.com/find_link?q=S%E1%BB%91_d%C6%B0_N... http://meta.wkhealth.com/pt/pt-core/template-journ... http://healthlinks.washington.edu/nutrition/sectio... //pubmed.ncbi.nlm.nih.gov/18403920 //doi.org/10.1097%2FMCO.0b013e3282fba5d7 http://cancerweb.ncl.ac.uk/cgi-bin/omd?nitrogen+ba... https://web.archive.org/web/20071223190603/http://... https://web.archive.org/web/20110928120632/http://... https://web.archive.org/web/20120209162314/http://...