@misc{indiciae6e851b57e36d,
  title = {Colour coding for piped Entonox hoses.},
  author = {L Ng and H Hopwood},
  year = {2002},
  doi = {10.1046/j.1365-2044.2002.2575\_5.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/11949650/},
  note = {Source identifier: 11949650}
}