@incollection{TUW-189378, author = {Heinkelmann, Robert and Schuh, Harald}, title = {Very long baseline interferometry: accuracy limits and relativistic tests}, booktitle = {Relativity in Fundamental Astronomy: Dynamics, References, Frames, and Data Analysis}, year = {2010}, pages = {286--290}, publisher = {Cambridge University Press}, isbn = {9780521764810} }