@misc{indiciae9eaf35091e55,
  title = {Directional valves for multiple gas collections.},
  author = {J G Mohler and S Rao and H Hassin and B W Armstrong},
  year = {1969},
  doi = {10.1152/jappl.1969.27.5.765},
  url = {https://pubmed.ncbi.nlm.nih.gov/5360463/},
  note = {Source identifier: 5360463}
}