@misc{indiciae5a26d612f66d,
  title = {Advanced Transportation System Studies. Technical Area 3: Alternate Propulsion Subsystems Concepts: Program Cost Estimates - Volume 3},
  author = {Levack, Daniel J. H.},
  year = {2000},
  url = {https://ntrs.nasa.gov/citations/20000044345},
  note = {Source identifier: 20000044345}
}