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@unpublished{TUW-120336,
    author = {Todorova, Sonya and Hobiger, Thomas and Schuh, Harald},
    title = {Combined global ionosphere maps from GPS and satellite altimetry},
    year = {2006},
    note = {talk: EGU 2006, Wien; 2006-04-03 -- 2006-04-07}
}