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WikiPedia: Giám sát hàng loạt https://en.tempo.co/read/news/2013/11/04/074526933... https://books.google.com/books?id=JP6lDQAAQBAJ&pg=... https://books.google.com/books?id=gBbICgAAQBAJ&pg=... https://www.reuters.com/article/2013/06/07/us-usa-... https://internetnz.nz/sites/default/files/submissi... https://web.archive.org/web/20131217223936/http://... https://www.privacyinternational.org/node/52 https://www.privacyinternational.org/reports/surve...