@misc{indiciaeef60208d3c59,
  title = {Observation requirements for unmanned planetary missions, part 2},
  author = {Jones, A. C. and Weddell, J. B.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700023775},
  note = {Source identifier: 19700023775}
}