@misc{indiciaecc26ba9169e4,
  title = {Second-order optional avoidance as a function of fixed-ratio requirements.},
  author = {N A Krasnegor and J V Brady and J D Findley},
  year = {1971},
  doi = {10.1901/jeab.1971.15-181},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811498/},
  note = {Source identifier: 16811498}
}