@misc{indiciae6f28a96818fe,
  title = {Propulsion system advances that enable a reusable Liquid Fly Back Booster (LFBB)},
  author = {Keith, E. L. and Rothschild, W. J.},
  year = {1998},
  url = {https://ntrs.nasa.gov/citations/19990007761},
  note = {Source identifier: 19990007761}
}