@misc{indiciaeed20d3033808,
  title = {Solar electric space mission analysis Progress report, 1 Jun. - 31 Dec. 1966},
  author = {Layton, J. P. and Lion, P. M.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670017049},
  note = {Source identifier: 19670017049}
}