Norris, Robert S.; Arkin, William M.; Burr, William (1999). "Where they were"(PDF). Bulletin of the Atomic Scientists. 55 (6): 26–35. doi:10.2968/055006011.
"Archived copy"(PDF). hpschapters.org. Archived from the original(PDF) on 25 February 2007. Retrieved 17 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
Norris, Robert S.; Arkin, William M.; Burr, William (1999). "Where they were"(PDF). Bulletin of the Atomic Scientists. 55 (6): 26–35. doi:10.2968/055006011.
web.archive.org
"Archived copy"(PDF). hpschapters.org. Archived from the original(PDF) on 25 February 2007. Retrieved 17 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)