@misc{indiciae469ced645c34,
  title = {Performance projections of alternative AMTEC systems and devices},
  author = {Underwood, Mark L. and Williams, Roger M. and Jeffries-Nakamura, Barbara and Ryan, A. M. and O'Connor, Dennis},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19930029814},
  note = {Source identifier: 19930029814}
}