@misc{indiciaeec0ddd69c49d,
  title = {Analytic solution for optimal two-impulse 180 deg transfer between noncoplanar orbits and the optimal orientation of the transfer plane.},
  author = {Sun, F. T.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680057710},
  note = {Source identifier: 19680057710}
}