@inproceedings{TUW-176295, author = {Alizadeh, Mahdi and Todorova, Sonya and Kudryashova, Maria and Weber, Robert and Schuh, Harald}, title = {Assessment of GNSS and Satellite Altimetry Combined Global Ionospheric Maps Using Precise Point Positioning}, booktitle = {European Geosciences Union, General Assembly 2008}, year = {2008}, publisher = {European Geosciences Union} }