@book { DeutscheGoBimJahr2001,
    title = "Deutsche GoB im Jahr 2001",
    author = "Matthias {Rattay}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832445393",
    url = "https://m.diplom.de/document/220137"
}