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@unpublished{TUW-120221,
    author = {Todorova, Sonya and Hobiger, Thomas and Weber, Robert and Schuh, Harald},
    title = {Using GPS for determination of the ionosphere},
    year = {2005},
    note = {talk: International Scientific Conference SGEM 2005, Albena, Bulgaria; 2005-06-13 -- 2005-06-17}
}