@misc{indiciae082bacd2e2cd,
  title = {Hybrid propulsion technology program: Phase 1, volume 4},
  author = {Claflin, S. E. and Beckman, A. W.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19910000801},
  note = {Source identifier: 19910000801}
}