@unpublished{TUW-120923, author = {Englich, Sigrid and Weber, Robert and Schuh, Harald and Mendes Cerveira, Pj.}, title = {Tidal excitation of Earth rotation observed by GPS and VLBI}, year = {2007}, note = {poster presentation: IUGG 2007, Perugia, Itallien; 2007-07-02 -- 2007-07-10} }