@book { HerausforderungLeerstand,
    title = "Herausforderung Leerstand",
    subtitle = "Nutzerorientierte Büroimmobilienanalyse zur Ermittlung von Revitalisierungspotentialen",
    author = "Wolfgang {Brunauer}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832484361",
    url = "https://m.diplom.de/document/223623"
}