@article{small,
  title={Sulfate minerals and organic compounds on Mars},
  author={Aubrey, Andrew;  Cleaves, H. James ; Chalmers, John H. ; Skelley, Alison M. ; Mathies, Richard A. ; Grunthaner, Frank J. ; Ehrenfreund, Pascale ; Bada, Jeffrey L.},
  journal={Geology},
  volume={34},
  pages={357-360},
  year={2006},
  doi={https://doi.org/10.1130/G22316.1}
}