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@unpublished{TUW-119836,
    author = {Vondrak, J. and Cyril, R. and Weber, Robert},
    title = {Celestial Motion of Earth's spin axis derived from the Combination of VLBI and GPS observations},
    year = {2004},
    note = {talk: AGU Fall Meeting San Francisco, San Francisco; 2004-12-13 -- 2004-12-17}
}