@misc{indiciae009b2a884dcf,
  title = {Calibration unit for halothane analysers.},
  author = {A Zwart and G Oostveen},
  year = {1973},
  doi = {10.1007/bf02478671},
  url = {https://pubmed.ncbi.nlm.nih.gov/4787940/},
  note = {Source identifier: 4787940}
}