@article{TUW-120546, author = {Hobiger, Thomas and Kondo, Tetsuro and Schuh, Harald}, title = {VLBI as a Tool to Probe the Ionosphere}, journal = {IVS General Meeting Proceedings}, year = {2006}, volume = {Conception, Chile, January 9-11}, number = {NASA/CP-2006-214140}, pages = {344--348} }