@misc{indiciae5a0be289d99a,
  title = {Variable features on Mars 2: Mariner 9 global results},
  author = {Sagan, C. and Veverka, J. and Fox, P. and Dubisch, R. and French, R. and Gierasch, P. and Quam, L. and Lederberg, J. and Levinthal, E. and Tucker, R.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730023960},
  note = {Source identifier: 19730023960}
}