Schmidt, R. ., Petrovic, S. ., Güntner, A. ., Barthelmes, F. ., Wünsch, J. ., & Kusche, J. . (2008). Periodic components of water storage changes from GRACE and global hydrology models. Journal of Geophysical Research (Solid Earth), 113, 08419. http://doi.org/10.1029/2007JB005363 (Original work published August 2008)