@book { KostenmanagementimImmobilienlebenszyklusdurchFacilityManagement,
    title = "Kostenmanagement im Immobilienlebenszyklus durch Facility Management",
    author = "Rene {Leutert}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836608268",
    url = "https://m.diplom.de/document/228994"
}