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WikiPedia: Tuổi_thọ_trung_bình http://www.fam.tuwien.ac.at/public/simulation/life... http://www.britannica.com/EBchecked/topic/387301/m... http://www.ted.com/index.php/talks/view/id/140 http://jerrymondo.tripod.com/lgev/id1.html http://ucatlas.ucsc.edu/life/index.html http://www.digitalhistory.uh.edu/historyonline/usd... http://www.utexas.edu/depts/classics/documents/Lif... http://www.europa.eu/rapid/pressReleasesAction.do?... http://cdc.gov/mmwr/preview/mmwrhtml/00056796.htm http://www.cdc.gov/nchs/fastats/lifexpec.htm