@misc{indiciaed4661e787f58,
  title = {Performance on variable-interval schedules arranged singly and concurrently.},
  author = {M C Davison and I W Hunter},
  year = {1976},
  doi = {10.1901/jeab.1976.25-335},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811917/},
  note = {Source identifier: 16811917}
}