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@unpublished{TUW-120335,
    author = {Todorova, Sonya and Hobiger, Thomas and Schuh, Harald},
    title = {Combination of GPS and satellite altimetry data for global ionosphere maps},
    year = {2006},
    note = {talk: SGEM2006, Albena; 2006-06-12 -- 2006-06-16}
}