@misc{indiciae25dac6ed66ce,
  title = {Gas sampling from a facemask for capnography.},
  author = {J R Machin and A MacNeil},
  year = {1986},
  doi = {10.1111/j.1365-2044.1986.tb12946.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/3096163/},
  note = {Source identifier: 3096163}
}