@book { LangeWellenderKonjunktur,
    title = "Lange Wellen der Konjunktur",
    author = "Christoph {Mittermaier}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1096425"
}