@misc{indiciaefc6f43cce4a5,
  title = {Vehicle path-planning in three dimensions using optics analogs for optimizing visibility and energy cost},
  author = {Rowe, Neil C. and Lewis, David H.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900020537},
  note = {Source identifier: 19900020537}
}