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@unpublished{TUW-119975,
    author = {Todorova, Sonya and Hobiger, Thomas and Schuh, Harald},
    title = {Combined ionosphere models from different space geodetic techniques},
    year = {2005},
    note = {poster presentation: SGEM 2005, Albena, Bulgaria; 2005-06-13 -- 2005-06-17}
}