@article{TUW-119994, author = {Hobiger, Thomas and B{\"o}hm, Johannes and Schuh, Harald}, title = {VLBIONOS - Probing the Ionosphere by means of very long Basline Interferometry}, journal = {Springer}, year = {2005}, volume = {IAG Symposia, Vol. 128}, number = {ISBN 3-540-24055-1}, pages = {131--136} }