@misc{indiciae0a2a9a037ad9,
  title = {Ion Propulsion Module design and mission performance},
  author = {Graf, J. E. and Boain, R. J. and Pawlik, E. V. and Pless, L. C.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780053523},
  note = {Source identifier: 19780053523}
}