@book { Zwangsumtausch,
    title = "Zwangsumtausch",
    subtitle = "Wie Kohl und Lafontaine die D-Mark abschafften",
    author = "Jens Peter {Paul}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136033"
}