@misc{indiciae2ed3ceafda86,
  title = {A simple method for studying operant wheel running in rats.},
  author = {A L Porterfield and J J Stern},
  year = {1974},
  doi = {10.1016/0031-9384(74)90160-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/4832450/},
  note = {Source identifier: 4832450}
}