@misc{indiciae529e2f8072d5,
  title = {Portable CO2 detectors.},
  author = {J M Hopper and K M Porter},
  year = {1993},
  doi = {10.1136/emj.10.4.382-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/8110340/},
  note = {Source identifier: 8110340}
}