@unpublished{TUW-120183, author = {Heinkelmann, Robert and Tanir, Emine and B{\"o}hm, Johannes and Schuh, Harald}, title = {Combination of long time series of tropospheric parameters observed by VLBI}, year = {2005}, note = {talk: Geod{\"a}tische Woche 2005, D{\"u}sseldorf; 2005-10-04 -- 2005-10-06} }