TY  - RPRT
TI  - Avoidance learning in heterogeneous and homogeneous shuttle boxes.
AU  - M R Denny
AU  - D J Zerbolio
AU  - R G Weisman
PY  - 1969
UR  - https://pubmed.ncbi.nlm.nih.gov/5817702/
ID  - 5817702
ER  -