TY  - RPRT
TI  - Alternative reinforcement effects on fixed-interval performance.
AU  - K A Lattal
AU  - S S Boyer
PY  - 1980
DO  - 10.1901/jeab.1980.34-285
UR  - https://pubmed.ncbi.nlm.nih.gov/16812190/
ID  - 16812190
ER  -