TY  - RPRT
TI  - Punishment contras during free-operant avoidance.
AU  - K A Lattal
AU  - M A Griffin
PY  - 1972
DO  - 10.1901/jeab.1972.18-509
UR  - https://pubmed.ncbi.nlm.nih.gov/16811640/
ID  - 16811640
ER  -