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@misc{TUW-222389,
    author = {Druml, Gernot and Kugi, Andreas},
    title = {Erweitertes Verfahren zur Erkennung der Richtung eines Erdschlusses},
    year = {2013},
    howpublished = {patent},
    note = {submitted: 2008-10-17, granted: 2013-01-15}
}