@misc{indiciae13b6590a50ed,
  title = {A continued program of planetary study},
  author = {Smith, Harlan and Cochran, William and Trafton, Laurence and Barker, Edwin and Cochran, Anita},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19890007311},
  note = {Source identifier: 19890007311}
}