@misc{indiciaeb8f8aee0f5b7,
  title = {Electric propulsion for communications satellites},
  author = {Free, B. A. and Guman, W. J. and Herron, B. G. and Zafran, S.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780049059},
  note = {Source identifier: 19780049059}
}