1. Combining the Orbits of the IGS Processing Centers;Beutler,1993
2. The Impact of Ultra-Rapid Orbits on Precipitable Wator Vapor Estimation using Ground GPS Network;Douša;1999 IGS Network Workshop,2000
3. Reducing the Satellite Orbit Error Effects in Near Real-Time GPS Zenith Tropospheric Delay Estimation for Meteorology;Ge;Geophysical Research Letters,2000
4. IGS Combination of Tropospheric Estimates — The Pilot Experiment;Gendt,1998
5. Analysis Activities;Kouba,1999