@misc{indiciae41e397f7b41c,
  title = {Rates and patterns of responding with concurrent fixed-interval and variable-interval reinforcement.},
  author = {J A Nevin},
  year = {1971},
  doi = {10.1901/jeab.1971.16-241},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811545/},
  note = {Source identifier: 16811545}
}