TY  - RPRT
TI  - Design alternatives for computer network security 
AU  - Cole, Gerald D
AU  - Branstad, Dennis K
PY  - 1978
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 500-21v1
DO  - 10.6028/NBS.SP.500-21v1
ER  -