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@unpublished{TUW-120920,
    author = {Steigenberger, Peter and Tesmer, V. and B{\"o}hm, Johannes},
    title = {A priori gradients in the analysis of GPS and VLBI ovservations},
    year = {2007},
    note = {talk: IERS Conventions workshop, Paris, Frankreich; 2007-09-20 -- 2007-09-21}
}