@inproceedings{TUW-120396, author = {Fragner, Elisabeth and Weber, Robert}, title = {The impact of precise orbit information on ZTD and IWV estimates using ground based GNSS data}, booktitle = {GNSS 2003}, year = {2003}, note = {poster presentation: GNSS 2003, Graz; 2003-04-22 -- 2003-04-25} }