@incollection{TUW-119306, author = {Vondrak, J. and Weber, Robert and Ron, C.}, title = {Earth Orientation Parameters - Combination of Results Obtained by Different Techniques}, booktitle = {IAG 2001 Scientific Assembly Proceedings}, year = {2002}, pages = {24--29}, organization = {J.Adam, K.P.Schwarz}, publisher = {IAG-Symposia}, address = {Springer} }