@misc{indiciae21ddd8959355,
  title = {Gifford-McMahon refrigerator with split cold head},
  author = {Forth, H. J. and Heisig, R. and Klein, H. H.},
  year = {1983},
  url = {https://ntrs.nasa.gov/citations/19840007278},
  note = {Source identifier: 19840007278}
}