@misc{indiciaef6005474025b,
  title = {Program evaluation and system control.},
  author = {R Zemach},
  year = {1973},
  doi = {10.2105/ajph.63.7.607},
  url = {https://pubmed.ncbi.nlm.nih.gov/4716371/},
  note = {Source identifier: 4716371}
}