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.
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.