@misc{indiciae55e5a8c7b907,
  title = {High Altitude Launch for a Practical SSTO},
  author = {Landis, Geoffrey A. and Denis, Vincent and Lyons, Valerie},
  year = {2003},
  url = {https://ntrs.nasa.gov/citations/20030022661},
  note = {Source identifier: 20030022661}
}