TY  - RPRT
TI  - Discrimination in the squirrel monkey as a function of deprivation and problem difficulty.
AU  - R C MILES
PY  - 1959
DO  - 10.1037/h0049280
UR  - https://pubmed.ncbi.nlm.nih.gov/13620860/
ID  - 13620860
ER  -