@misc{indiciaec49b03c7d427,
  title = {Advanced Supersonic Technology Study: Engine Program Summary. Supersonic Propulsion: 1971 to 1976},
  author = {Krebs, J. N.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19770011069},
  note = {Source identifier: 19770011069}
}