1. Spectroscopic evidence for hydrous iron sulfate in the Martian soil
2. J.J. Freeman, M. Jin, A. Wang, 39th Lunar and Planetary Science Conference, Houston, USA, 2008 (abs# 2390).
3. NIR spectroscopy of selected iron(II) and iron(III) sulphates
4. M.D. Dyar, Y. Rothstein, M.W. Schaefer, M.D. Lane, in preparation.
5. J.J. Papike, P.V. Burger, J.M. Karner, C.K. Shearer, Seventh International Congress on Mars, California Institute of Technology, Pasadena, California, USA, 2007, 3004.pdf.