@inproceedings{TUW-209041, author = {Alizadeh, Mahdi and Schuh, Harald and Schmidt, Michael}, title = {Global 4D modeling of electron density from GNSS, using spherical harmonics}, booktitle = {European Geosciences Union 2012}, year = {2012}, address = {14}, note = {poster presentation: European Geosciences Union, General Assembly 2012, Vienna, Austria; 2012-04-22 -- 2012-04-27} }