@misc{indiciaec8fb3d7505da,
  title = {Demand pacing, preferably with threshold control.},
  author = {J van den Berg and H J Thalen},
  year = {1969},
  doi = {10.1111/j.1749-6632.1969.tb34150.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5263826/},
  note = {Source identifier: 5263826}
}