@article{TUW-121082, author = {Mendes Cerveira, Pj. and B{\"o}hm, Johannes and Tanir, Emine and Wresnik, J{\"o}rg and Schuh, Harald and Tesmer, V.}, title = {Datum Deficiency in VLBI Analysis: Case Study of Session 021020XA; 18th EVGA Working Meeting}, journal = {Geowissenschaftliche Mitteilungen}, year = {2007}, volume = {Heft Nr. 79}, number = {Vienna, Austria, April 12-15}, pages = {209--215} }