@misc{indiciae4cc9d4b8f063,
  title = {Problems of planning.},
  author = {J W Walsh},
  year = {1969},
  doi = {10.1056/nejm196906192802520},
  url = {https://pubmed.ncbi.nlm.nih.gov/4890481/},
  note = {Source identifier: 4890481}
}