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4. Brumfiel, G. 2021b. “A New Tunnel Is Spotted At A Chinese Nuclear Test Site.” National Public Radio, July 30. https://www.npr.org/2021/07/30/1022209337/a-new-tunnel-is-spotted-at-a-chinese-nuclear-test-site
5. Bussiere, T. 2021. “Nuclear Deterrence Forum.” Mitchell Institute, August 27. https://mitchellaerospacepower.org/event/nuclear-deterrence-forum-lt-gen-thomas-a-bussiere-august-27-1130-am/