@misc{indiciae346b2a7cf6fe,
  title = {Concentrating breath samples using liquid nitrogen: a reliable method for the simultaneous determination of ethane and pentane.},
  author = {M D Knutson and F E Viteri},
  year = {1996},
  doi = {10.1006/abio.1996.0438},
  url = {https://pubmed.ncbi.nlm.nih.gov/8923975/},
  note = {Source identifier: 8923975}
}