@misc{indiciaeaad21a6bf1c7,
  title = {Development of a nitrogen generation system},
  author = {Heppner, D. B. and Marshall, R. D. and Powell, J. D., III and Schubert, F. H.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800011518},
  note = {Source identifier: 19800011518}
}