2010
An analysis of the depth of collaboration between US and UK in nuclear weapon research and fabrication, and its legality under the nuclear Non-Proliferation Treaty. (Chapter 3 of this book: https://www.reachingcriticalwill.org/resources/publications-and-research/publications/105-beyond-arms-control-challenges-and-choices-for-nuclear-disarmament)
By John Ainslie
Download if the embedded viewer has a problem