@inproceedings{TUW-120394, author = {Fragner, Elisabeth and Weber, Robert}, title = {The impact of precise orbit information on ZTD and IWV estimates using ground based GNSS data}, booktitle = {IUGG Symposium}, year = {2003}, note = {poster presentation: IUGG Symposium, Sapporo; 2003-06-30 -- 2003-07-11} }