@unpublished{TUW-119744, author = {Mendes Cerveira, Pj. and Weber, Robert and Schuh, Harald}, title = {Deficiencies in monitoring global crustal deformation with GPS}, year = {2004}, note = {poster presentation: 15th International Symposium on Earth Tides, Ottawa, Canada; 2004-08-02 -- 2004-08-06} }