@misc{indiciae2657c2ad0f28,
  title = {Orbit transfer rocket engine technology program. Phase 2: Advanced engine study},
  author = {Erickson, C. and Martinez, A. and Hines, B.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19890000748},
  note = {Source identifier: 19890000748}
}