@unpublished{TUW-120908, author = {Mendes Cerveira, Pj. and Kl{\"u}gel, Thomas and Schreiber, Ulrich and Velikoseltsev, H. and Meurers, Bruno and Schuh, Harald}, title = {Earth rotation parameters from combined VLBI, ring laser and gravity observations}, year = {2007}, note = {talk: IUGG 2007, Perugia, Italien; 2007-07-02 -- 2007-07-13} }