@unpublished{TUW-120402, author = {B{\"o}hm, Johannes and Schuh, Harald and Weber, Robert}, title = {Tropospheric zenith path delays derived from GPS used for the determiantion of VLBI station heights}, year = {2002}, note = {poster presentation: IVS General Meeting, Tsukuba, Japan; 2002-02-04 -- 2002-02-07} }