TY  - RPRT
TI  - The transition zone of the visual approach slope indicator as a function of beam chromaticities 
AU  - Wall, Andrew C
PY  - 1962
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 7591
DO  - 10.6028/NBS.RPT.7591
ER  -