@misc{indiciae1697ffd0b707,
  title = {Six-man, self-contained carbon dioxide concentrator system},
  author = {Powell, J. D. and Schubert, F. H. and Marshall, R. D. and Shumar, J. W.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19740024437},
  note = {Source identifier: 19740024437}
}