@unpublished{TUW-238403, author = {M{\"o}ller, Gregor and Maras, Jadre and Umnig, Elke Maria and Weber, Robert}, title = {Ground based GNSS as observing techniques for water vapour in the troposphere}, year = {2015}, note = {invited; talk: University of Innsbruck / Institute of Meteorology and Geophysics, Innsbruck; 2015-02-26} }