TY  - RPRT
TI  - Real and imagined cost effects upon human fixed-interval responding.
AU  - H Weiner
PY  - 1965
DO  - 10.2466/pr0.1965.17.2.659
UR  - https://pubmed.ncbi.nlm.nih.gov/5833752/
ID  - 5833752
ER  -