@misc{indiciaee15f8987ec7e,
  title = {Differentiating one smooth operator from another.},
  author = {F C Luft},
  year = {1999},
  doi = {10.1007/s001090050347},
  url = {https://pubmed.ncbi.nlm.nih.gov/10023778/},
  note = {Source identifier: 10023778}
}