@misc{indiciae1b4cd8a168a0,
  title = {A Study of Variable Features on Mars During the Viking Primary Mission},
  author = {Veverka, J. and Thomas, P. and Greeley, R.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780027504},
  note = {Source identifier: 19780027504}
}