TY  - RPRT
TI  - An Introduction to the description and evaluation of microwave systems using terminal invariant parameters 
AU  - Engen, Gleen F
PY  - 1969
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS MONO 112
DO  - 10.6028/NBS.MONO.112
ER  -