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WikiPedia: NTP http://www.ntpsurvey.arauc.br http://support.microsoft.com/kb/939322 http://www.eecis.udel.edu/~mills/database/reports/... http://www.eecis.udel.edu/~mills/ntp.html http://www.eecis.udel.edu/~mills/ntp/html/release.... http://servertest.online/ntp http://www.ietf.org/html.charters/ntp-charter.html http://www.pool.ntp.org/ http://www.pool.ntp.org/zone/vn http://support.ntp.org/