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@unpublished{TUW-183150,
    author = {Schuh, Harald},
    title = {The Global Geodetic Observing System (GGOS) of the IAG},
    year = {2009},
    note = {talk: Universidade Federal do Paran{\'a}, Curitiba, Curitiba, Brasilien; 2009-08-13 -- 2009-08-14}
}