@misc{indiciae620ff8dd2761,
  title = {One-man, self-contained CO2 concentrating system},
  author = {Wynveen, R. A. and Schubert, F. H. and Powell, J. D.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720017484},
  note = {Source identifier: 19720017484}
}