"Protective distribution system"(PDF). National Security Telecommunications and Information Systems Security Instruction number 7003. Committee on National Security Systems. December 13, 1996. Archived from the original(PDF) on July 13, 2006. Retrieved October 2, 2013.
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"Protective distribution system"(PDF). National Security Telecommunications and Information Systems Security Instruction number 7003. Committee on National Security Systems. December 13, 1996. Archived from the original(PDF) on July 13, 2006. Retrieved October 2, 2013.
