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@incollection{TUW-120811,
    author = {Frank, Andrew U.},
    title = {Qualitative Spatial Reasoning: Cardinal Directions as an Example},
    booktitle = {Classics from IJGIS},
    year = {2006},
    editor = {Fisher, Peter},
    pages = {327--353},
    organization = {CRC},
    publisher = {CRC Press},
    address = {Boca Raton, Fl.},
    isbn = {978-0-8493-7042-7}
}