TY  - RPRT
TI  - A simple method for studying operant wheel running in rats.
AU  - A L Porterfield
AU  - J J Stern
PY  - 1974
DO  - 10.1016/0031-9384(74)90160-7
UR  - https://pubmed.ncbi.nlm.nih.gov/4832450/
ID  - 4832450
ER  -