@misc{indiciaed8487915252d,
  title = {Low capacity Linde-Hampson nitrogen liquefier},
  author = {Hedegard, K. and Atkins, E. and Walker, G.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19920030775},
  note = {Source identifier: 19920030775}
}