@misc{indiciaece9a1c11ccfd,
  title = {Variable-ratio schedules as variable-interval schedules with linear feedback loops.},
  author = {J J McDowell and J T Wixted},
  year = {1986},
  doi = {10.1901/jeab.1986.46-315},
  url = {https://pubmed.ncbi.nlm.nih.gov/3805974/},
  note = {Source identifier: 3805974}
}