@inproceedings{TUW-119281, author = {Hobiger, Thomas and B{\"o}hm, Johannes and Schuh, Harald}, title = {Determination of Ionospheric Parameters by Geodetic VLBI}, booktitle = {IVS 2002 General Meeting Proceedings}, year = {2002}, pages = {345--349}, organization = {N.R. Vandenberg and K.D. Baver}, publisher = {Proceedings} }