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WikiPedia: Kiểm_soát_súng http://www.smallarmssurvey.org/weapons-and-markets... http://www.unodc.org/documents/organized-crime/Fir... https://www.theatlantic.com/politics/archive/2013/... https://www.theatlantic.com/technology/archive/201... https://www.atf.gov/file/58686/download https://www.loc.gov/law/help/firearms-control/ https://web.archive.org/web/20150111034848/http://... https://www.gunpolicy.org/firearms/compare/193/fir...