Gravity Field Solutions for dedicated Time Periods
The following gravity field time series are presently available:
J. Kusche, R. Schmidt, S. Petrovic, R. Rietbroek
Decorrelated GRACE time-variable gravity solutions by GFZ, and their validation using a hydrological model
Journal of Geodesy DOI:10.1007/s00190-009-0308-3
The final draft can be downloaded here.