@misc{indiciae40f63d674ebf,
  title = {Advanced Transportation System Studies. Technical Area 3: Alternate Propulsion Subsystem Concepts},
  author = {Levack, Daniel J. H.},
  year = {2000},
  url = {https://ntrs.nasa.gov/citations/20000044343},
  note = {Source identifier: 20000044343}
}