@misc{indiciaeb746163b1a1f,
  title = {The circle system without absorber. Use with controlled ventilation.},
  author = {S L Snowdon and D L Powell and E T Fadl and J E Utting},
  year = {1975},
  doi = {10.1111/j.1365-2044.1975.tb00863.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/1096653/},
  note = {Source identifier: 1096653}
}