@misc{indiciae387e772f6dac,
  title = {Propulsion System Advances that Enable a Reusable Liquid Fly Back Booster (LFBB)},
  author = {Keith, Edward L. and Rothschild, William J.},
  year = {1998},
  url = {https://ntrs.nasa.gov/citations/19990079864},
  note = {Source identifier: 19990079864}
}