@misc{indiciaec81bd70f787e,
  title = {Efficient purchasing.},
  author = {A Clarke and M McKee and J Appleby and T Sheldon},
  year = {1993},
  doi = {10.1136/bmj.307.6917.1436},
  url = {https://pubmed.ncbi.nlm.nih.gov/8281080/},
  note = {Source identifier: 8281080}
}