@article{TUW-120886, author = {Heinkelmann, Robert and Schmidt, Michael and B{\"o}hm, Johannes and Schuh, Harald}, title = {Long-term trends of water vapour from VLBI observations; 18th EVGA Working Meeting}, journal = {Geowissenschaftliche Mitteilungen}, year = {2007}, volume = {Heft Nr. 79}, number = {Vienna, Austria, April 12-15}, pages = {88--92} }