@misc{indiciae978be74804f7,
  title = {Lever holding under free-operant avoidance.},
  author = {H M Hurwitz},
  year = {1967},
  doi = {10.1901/jeab.1967.10-551},
  url = {https://pubmed.ncbi.nlm.nih.gov/6080834/},
  note = {Source identifier: 6080834}
}