@misc{indiciae21037292d818,
  title = {Optimality And Concurrent Variable-interval Variable-ratio Schedules.},
  author = {W Baum and C Aparicio},
  year = {1999},
  doi = {10.1901/jeab.1999.71-75},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812893/},
  note = {Source identifier: 16812893}
}