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@unpublished{TUW-204750,
    author = {Frank, Andrew U.},
    title = {Quality of data in GIS: How to define data Quality? How to measure and value it?},
    year = {2011},
    note = {invited; talk: Verleihung des Titels ''Doctor Honoris Causa'', University of Debrecen; 2011-11-26}
}