@book { DiedeutscheInflation19191923,
    title = "Die deutsche Inflation 1919-1923",
    subtitle = "Politik und Ökonomie",
    author = "Helmut {Kerstingjohänner}",
    year = "2004",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097178"
}