https://www.fourmilab.ch/documents/pluto/
https://www.scientificamerican.com/article/russias-new-nukes-are-similar-to-a-risky-project-the-u-s-abandoned/
https://en.wikipedia.org/wiki/Ramjet
https://en.wikipedia.org/wiki/Project_Pluto
https://www.popularmechanics.com/military/weapons/a13978519/slam-cruise-missile-nuclear-thermonuclear/