TY  - RPRT
TI  - Measurement procedures for the optical beam splitter attenuation device BA-1 
AU  - Danielson, B L
PY  - 1977
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 77-858
DO  - 10.6028/NBS.IR.77-858
ER  -