TY  - RPRT
TI  - Spatial-frequency masking and Birdsall's theorem.
AU  - R A Smith
AU  - D J Swift
PY  - 1985
DO  - 10.1364/josaa.2.001593
UR  - https://pubmed.ncbi.nlm.nih.gov/4045590/
ID  - 4045590
ER  -