TY  - RPRT
TI  - Negative reinforcement with shock-frequency increase.
AU  - E T Gardner
AU  - P Lewis
PY  - 1976
DO  - 10.1901/jeab.1976.25-3
UR  - https://pubmed.ncbi.nlm.nih.gov/16811893/
ID  - 16811893
ER  -