@misc{indiciae003584e65c3e,
  title = {Booster Main Engine Selection Criteria for the Liquid Fly-Back Booster},
  author = {Ryan, Richard M. and Rothschild, William J. and Christensen, David L.},
  year = {1998},
  url = {https://ntrs.nasa.gov/citations/19990079862},
  note = {Source identifier: 19990079862}
}