@misc{indiciae113a139ff9e2,
  title = {Variable features on Mars. II - Mariner 9 global results.},
  author = {Sagan, C. and Veverka, J. and Fox, P. and Dubisch, F. and French, R. and Gierasch, P. and Quam, L. and Lederberg, J. and Levinthal, E. and Pollack, J. B.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730052410},
  note = {Source identifier: 19730052410}
}