@misc{indiciae8279dfdd755b,
  title = {Shuttle evolution - Improved aft propulsion system},
  author = {Karakulko, Witalij and Frazier, Scott R.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890059521},
  note = {Source identifier: 19890059521}
}