@misc{indiciaed360a2f9eb86,
  title = {Evidence against a constant-difference effect in concurrent-chains schedules.},
  author = {James E Mazur},
  year = {2002},
  doi = {10.1901/jeab.2002.77-147},
  url = {https://pubmed.ncbi.nlm.nih.gov/11936248/},
  note = {Source identifier: 11936248}
}