@unpublished{TUW-168950, author = {Schuh, Harald and B{\"o}hm, Johannes and Heinkelmann, Robert and Pany, Andrea}, title = {Observation Level Versus a Posteriori Atmosphere Loading Corrections in VLBI Analysis}, year = {2008}, note = {poster presentation: AGU Fall Meeting San Francisco, San Francisco; 2008-12-15 -- 2008-12-19} }