@book { EuropischeImmobilienbewertungsstandards,
    title = "Europäische Immobilienbewertungsstandards",
    author = "David {Lorenz}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832444921",
    url = "https://m.diplom.de/document/220093"
}