@misc{indiciae1162cf77a927,
  title = {MEPSIS - Minimal electric propulsion systems for interplanetary spacecraft.},
  author = {Duck, K. I. and Isley, W. C.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690054725},
  note = {Source identifier: 19690054725}
}