TY  - RPRT
TI  - A dual channel, double heterodyned phase shift measurement system 110 MHz to 18 GHz 
AU  - Roe, Keith C
PY  - 1973
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 73-307
DO  - 10.6028/NBS.IR.73-307
ER  -