Editing Permissive action link (section)

==External links==
* {{cite web|url=http://nuclearweaponarchive.org/Usa/Weapons/Pal.html |title=Principles of Nuclear Weapons Security and Safety |date=October 1, 1997 |access-date=April 29, 2010}}
* {{cite web|url=https://www.cs.columbia.edu/~smb/nsam-160/pal.html |title=Permissive Action Links |publisher=Cs.columbia.edu |access-date=April 29, 2010}}
* [https://web.archive.org/web/20031225004426/http://www.brook.edu/fp/projects/nucwcost/box9_2.htm The JCAE and the Development of the Permissive Action Link]
* [https://web.archive.org/web/20120511191600/http://www.cdi.org/blair/permissive-action-links.cfm Keeping Presidents in the Nuclear Dark]
* [http://www.cl.cam.ac.uk/~rja14/book.html Security Engineering], [http://www.cl.cam.ac.uk/~rja14/Papers/SE-11.pdf Chapter 11: Nuclear Command and Control], [[Ross J. Anderson|Ross Anderson]], {{ISBN|0-471-38922-6}}
* {{cite news|url=http://news.bbc.co.uk/media/avdb/news/uk/video/133000/bb/133417_16x9_bb.asx |title=BBC News (video) |access-date=April 29, 2010}}
* [https://www.bbc.co.uk/mediaselector/check/player/nol/newsid_7090000/newsid_7099100?redirect=7099125.stm&news=1&nbram=1&nbwm=1&bbram=1&bbwm=1 ''The Dr. Strangelove scenario''] - a BBC ''[[Newsnight]]'' report featuring the lack of security features on the [[WE.177]] (streaming video)
* {{cite web |url=https://www.youtube.com/watch?v=F1LPmAF2eNA |title=The Remarkable Mechanism That Secures Nuclear Weapons}} - Youtube

[[Category:United States nuclear command and control]]
[[Category:Nuclear weapon safety]]
[[Category:Nuclear weapons]]
[[Category:Nuclear command and control]]