S.-C. Han, H. Kim, I.-Y. Yeo, P. Yeh, T. Oki, K.-W. Seo, D. Alsdorf, and S. B. Luthcke, Dynamics of surface water storage in the Amazon inferred from measurements of inter-satellite distance change, Geophysical Research Letter, 36, L09403, doi:10.1029/2009GL037910, 200905