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@unpublished{TUW-120972,
    author = {Todorova, Sonya and Schuh, Harald and Hobiger, Thomas and Hernandez-Pajares, Manuel},
    title = {Combination of different space geodetic techniques towards integrated global ionosphere maps},
    year = {2007},
    note = {poster presentation: IUGG 2007, Perugia, Italien; 2007-07-02 -- 2007-07-13}
}