@misc{indiciae3e37b120fe63,
  title = {Collapsible nozzle extension for rocket engines Patent},
  author = {Darrow, W. E., Jr. and Ursery, B. C.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19710006749},
  note = {Source identifier: 19710006749}
}