@misc{indiciaec7a56acf8238,
  title = {Mariner Mars 1969 optical approach navigation},
  author = {Breckenridge, W. G. and Duxbury, T. C.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700042036},
  note = {Source identifier: 19700042036}
}