TY  - RPRT
TI  - Visual detectability gradients: effect of illiteracy.
AU  - F Ostrosky-Solis
AU  - R Efron
AU  - E W Yund
PY  - 1991
DO  - 10.1016/0278-2626(91)90065-g
UR  - https://pubmed.ncbi.nlm.nih.gov/1781980/
ID  - 1781980
ER  -