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@unpublished{TUW-120224,
    author = {Hobiger, Thomas and Kondo, Tetsuro and Schuh, Harald},
    title = {VLBI as a tool to probe the ionosphere},
    year = {2005},
    note = {talk: EGU 2005, Vienna; 2005-04-24 -- 2005-04-29}
}