@misc{indiciae38bdfc614d0e,
  title = {Multi-asteroid comet missions using solar electric propulsion.},
  author = {Bender, D. F. and Bourke, R. D.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720045274},
  note = {Source identifier: 19720045274}
}