@book { VirtuelleFacilitiesManager,
    title = "Virtuelle Facilities Manager",
    author = "Nadine {Spörl}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832441685",
    url = "https://m.diplom.de/document/219790"
}