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@incollection{TUW-119276,
    author = {Winter, Stephan and Bittner, Thomas},
    title = {Hierarchical Topological Reasoning with Vague Regions},
    booktitle = {Spatial Data Quality},
    year = {2002},
    publisher = {Taylor {\&} Francis},
    address = {London},
    url = {ftp://ftp.geoinfo.tuwien.ac.at/winter/winter02hierarchical.pdf}
}