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@misc{TUW-199499,
    author = {Druml, Gernot and Kugi, Andreas},
    title = {Erweitertes Verfahren zur Erkennung der Richtung eines Erdschlusses},
    year = {2010},
    howpublished = {patent},
    note = {submitted: 2009-05-12, granted: 2010-04-22}
}