@book { DieEuropischeWhrungsunion,
    title = "Die Europäische Währungsunion",
    author = "Alexandra {Krzyzniewski}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832439316",
    url = "https://m.diplom.de/document/219570"
}