TY  - RPRT
TI  - Federal Information Processing Standards Publication: coding and modulation requirements for duplex 9600 bitsecond modems 
PY  - 1981
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS FIPS 135
DO  - 10.6028/NBS.FIPS.135
ER  -