Brückner, J., Dreibus, G., Rieder, R., & Wänke, H. (2003). Refined data of Alpha Proton X-ray Spectrometer analyses of soils and rocks at the Mars Pathfinder site: Implications for surface chemistry. Journal of Geophysical Research, 108(E12): 8094. doi:10.1029/2003JE002060.