@misc{indiciaefc2c74f247c7,
  title = {PLAN-IT: Scheduling assistant for solar system exploration},
  author = {Dias, William C. and Henricks, Julia A. and Wong, Jennifer C.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19890000697},
  note = {Source identifier: 19890000697}
}