@misc{indiciaecd958d43ed15,
  title = {Solar electric propulsion system evaluation.},
  author = {Costogue, E. and Ferrara, J. D. and Macie, T. W. and Pawlik, E. V.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690054719},
  note = {Source identifier: 19690054719}
}