@misc{indiciaed63190f30cce,
  title = {On measuring costs and profit.},
  author = {John D Keen},
  year = {2006},
  doi = {10.2214/ajr.06.5034},
  url = {https://pubmed.ncbi.nlm.nih.gov/16632705/},
  note = {Source identifier: 16632705}
}