man and html pages as included in source code

NTPsec Documentation

White Papers

Stratum-1-Microserver HOWTO

RFCs

RFCs

Other NTP Projects

NTP Classic

Chrony

OpenNTP

Pool

IETF ntpwg

Official National Sources of Time

Official Sources of Time

NTP Misuse and Abuse

Wikipedia: NTP server misuse and abuse

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