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@unpublished{TUW-120577,
    author = {Todorova, Sonya and Hobiger, Thomas and Weber, Robert and Schuh, Harald},
    title = {Determination of the ionosphere with different space geodetic techniques},
    year = {2005},
    note = {talk: Technical Conference for Doctoral Study JUNIORSTAV, Brno; 2005-02-02}
}