United Nations Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, Including the Moon and Other Celestial Bodies. United Nations General Assembly Resolution 2222 (XXI); entered into force on October 10, 1967. https://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/outerspacetreaty.html (1967). Carpenter, J.M. Pulsed spallation neutron sources for slow neutron scattering. Core. Instrument. Methods 14591-113