@inproceedings{TUW-120351, author = {Hobiger, Thomas and Kondo, Tetsuro and Schuh, Harald}, title = {How VLBI can contribute to ionospheric research}, booktitle = {AGU 2004}, year = {2004}, note = {poster presentation: AGU Fall Meeting San Francisco, San Francisco; 2004-12-13 -- 2004-12-17} }