TY  - RPRT
TI  - Response duration in operant level, regular reinforcement, and extinction.
AU  - S MARGULIES
PY  - 1961
DO  - 10.1901/jeab.1961.4-317
UR  - https://pubmed.ncbi.nlm.nih.gov/14469791/
ID  - 14469791
ER  -