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@unpublished{TUW-120298,
    author = {Heinkelmann, Robert and B{\"o}hm, Johannes and Schuh, Harald},
    title = {Combination of long time series of tropospheric parameters observed by VLBI},
    year = {2006},
    note = {talk: IVS General Meeting, Concepcion, Chile; 2006-01-09 -- 2006-01-11}
}