@article{TUW-120777, 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}, journal = {Springer}, year = {2002}, volume = {IAG Symposia Vol. 124}, number = {ISBN 3-540-43011-3}, pages = {107--112} }