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@unpublished{TUW-120925,
    author = {Heinkelmann, Robert and Schmidt, Michael and B{\"o}hm, Johannes and Schuh, Harald},
    title = {Long-term trends of water vapour from VLBI observations},
    year = {2007},
    note = {talk: 18th EVGA Working Meeting, Wien; 2007-04-13}
}