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WikiPedia: Chi Cơm cháy http://en.coca-colahellenic.at/Productsandbrands/S... http://www.ville-ge.ch/musinfo/bd/cjb/africa/detai... http://botanical.com/botanical/mgmh/e/elder-04.htm... http://www.britannica.com/EBchecked/topic/182200 http://www.news-herald.com/article/HR/20161025/FEA... http://www.oldandsold.com/articles22/watch-repair-... http://www.ars-grin.gov/cgi-bin/npgs/html/genus.pl... //www.ncbi.nlm.nih.gov/pmc/articles/PMC4472577 //www.ncbi.nlm.nih.gov/pmc/articles/PMC5325840 //www.ncbi.nlm.nih.gov/pubmed/26028422