@misc{indiciaeb526e0c57600,
  title = {Concurrent variable-ratio schedules: Implications for the generalized matching law.},
  author = {J S Macdonall},
  year = {1988},
  doi = {10.1901/jeab.1988.50-55},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812549/},
  note = {Source identifier: 16812549}
}