TY  - RPRT
TI  - Discriminated punishment: avoidable and unavoidable shock.
AU  - J Gibbon
PY  - 1967
DO  - 10.1901/jeab.1967.10-451
UR  - https://pubmed.ncbi.nlm.nih.gov/6050057/
ID  - 6050057
ER  -