"Nuclear Matters Handbook 2020 (Revised)"(PDF). Office of the Deputy Assistant Secretary of Defense for Nuclear Matters. 2020. p. 40. Archived(PDF) from the original on 4 October 2025. Retrieved 4 November 2025.
"Nuclear Matters Handbook 2020 (Revised)"(PDF). Office of the Deputy Assistant Secretary of Defense for Nuclear Matters. 2020. p. 40. Archived(PDF) from the original on 4 October 2025. Retrieved 4 November 2025.