TY  - RPRT
TI  - Negative reinforcement as shock-frequency reduction.
AU  - R J Herrnstein
AU  - P N Hineline
PY  - 1966
DO  - 10.1901/jeab.1966.9-421
UR  - https://pubmed.ncbi.nlm.nih.gov/5961510/
ID  - 5961510
ER  -