@misc{indiciaeaf26d42ec501,
  title = {Key-peck probability and topography in a concurrent variable-interval variable-interval schedule with food and water reinforcers.},
  author = {B O Ploog and H P Zeigler},
  year = {1997},
  doi = {10.1901/jeab.1997.67-109},
  url = {https://pubmed.ncbi.nlm.nih.gov/9037783/},
  note = {Source identifier: 9037783}
}