@inproceedings{TUW-176347, author = {Mendes Cerveira, Pj. and Heinkelmann, Robert and Weber, Robert and Schuh, Harald}, title = {Associativity in the datum definition of VLBI analysis and its implication on the terrestrial reference frame}, booktitle = {European Geosciences Union, General Assembly 2007}, year = {2007}, publisher = {European Geosciences Union} }