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@unpublished{TUW-120185,
    author = {Heinkelmann, Robert and B{\"o}hm, Johannes and Schuh, Harald},
    title = {Combination of long time series of tropospheric parameters observed by VLBI},
    year = {2005},
    note = {poster presentation: IERS Analysis Workshop, Potsdam; 2005-10-10 -- 2005-10-11}
}