@misc{indiciae9b6c10b1bc7a,
  title = {Spaced responding in multiple DRL schedules.},
  author = {J ZIMMERMAN and C R SCHUSTER},
  year = {1962},
  doi = {10.1901/jeab.1962.5-497},
  url = {https://pubmed.ncbi.nlm.nih.gov/14003701/},
  note = {Source identifier: 14003701}
}