• https://www-01.ibm.com/support/docview.wss?uid=swg21989542
• https://www-01.ibm.com/support/docview.wss?uid=swg21988706
• https://www-01.ibm.com/support/docview.wss?uid=swg21986956
• https://www-01.ibm.com/support/docview.wss?uid=swg21985122
• https://www-01.ibm.com/support/docview.wss?uid=isg3T1024157
• https://www.ibm.com/support/home/docdisplay?lndocid=migr-5099409
• https://github.com/ntp-project/ntp/commit/5f295cd05c3c136d39f5b3e500a2d781bdbb59c8
• https://bugzilla.redhat.com/show_bug.cgi?id=1255118
• http://www.ubuntu.com/usn/USN-2783-1
• http://www.securityfocus.com/bid/76473
• http://www.openwall.com/lists/oss-security/2015/08/25/3
• http://www.debian.org/security/2015/dsa-3388
• http://rhn.redhat.com/errata/RHSA-2016-2583.html
• http://rhn.redhat.com/errata/RHSA-2016-0780.html
• http://lists.opensuse.org/opensuse-updates/2016-12/msg00153.html
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html
• http://lists.fedoraproject.org/pipermail/package-announce/2015-September/166992.html
• http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169167.html
• http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html
• http://aix.software.ibm.com/aix/efixes/security/ntp_advisory4.asc
• http://bk1.ntp.org/ntp-dev/?PAGE=patch&REV=51786731Gr4-NOrTBC_a_uXO4wuGhg
• http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
• https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11