@unpublished{TUW-119982, author = {Heinkelmann, Robert and B{\"o}hm, Johannes and Schuh, Harald}, title = {Combination of tropospheric parameters within IVS project TROPO}, year = {2005}, note = {poster presentation: 17th working meeting on European VLBI for Geodesy and Astrometry, Noto, Italy; 2005-04-22 -- 2005-04-23} }