@book { DieDoppelstiftung,
    title = "Die Doppelstiftung",
    subtitle = "Instrument zur Gestaltung der Unternehmensnachfolge",
    author = "Frank {Schuck}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107225"
}