@misc{indiciaee424b4346cd8,
  title = {Minimum-impulse time-free transfer between elliptic orbits},
  author = {Edelbaum, T. N. and Gobetz, F. W. and Washington, M.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660030604},
  note = {Source identifier: 19660030604}
}