@misc{indiciae20d03420585b,
  title = {Optimum guidance for a low thrust interplanetary vehicle.},
  author = {Breakwell, J. V. and Rauch, H. E.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660048129},
  note = {Source identifier: 19660048129}
}