@incollection{TUW-119298, author = {B{\"o}hm, Johannes and Schuh, Harald and Weber, Robert}, title = {Influence of tropospheric zenith delays obtained by GPS and VLBI on station heights}, booktitle = {Vertical Reference Systems - IAG Symposium, IAG Symposia Vol. 124}, year = {2002}, pages = {107--112}, organization = {H.Drewes, A.H.Dodson, L.P.S.Fortes, L.S{\'a}nchez, P.Sandoval}, publisher = {IAG-Symposia} }