@article{TUW-119484, author = {Hobiger, Thomas and B{\"o}hm, Johannes and Schuh, Harald}, title = {VLBIONOS - Probing the Ionosphere by Means of Very Long Baseline Interferometry}, journal = {{\"O}sterreichische Zeitschrift f{\"u}r Vermessung und Geoinformation (VGI)}, year = {2003}, volume = {Heft 1}, pages = {29--38} }