TY  - RPRT
TI  - Optical radiation measurements : Approximate theory of the photometric integrating sphere
AU  - Fussell, W B
PY  - 1974
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 594-7
DO  - 10.6028/NBS.TN.594-7
ER  -