TY  - RPRT
TI  - Procedural variation in behavioral avoidance tests.
AU  - D A Bernstein
AU  - M T Nietzel
PY  - 1973
DO  - 10.1037/h0035170
UR  - https://pubmed.ncbi.nlm.nih.gov/4795864/
ID  - 4795864
ER  -