@misc{indiciae1d8d69a51cbe,
  title = {Undeveloped rocket cycle applications to advanced earth-to-orbit transportation},
  author = {Kramer, R. D. and Martin, J. A.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900053577},
  note = {Source identifier: 19900053577}
}