@unpublished{TUW-120339, author = {Heinkelmann, Robert and B{\"o}hm, Johannes and Schuh, Harald}, title = {Comparison of global trends of integrated water vapor observed by VLBI, GPS and ECMWF}, year = {2006}, note = {talk: EGU 2006, Wien; 2006-04-02 -- 2006-04-07} }