@book { DasabstrakteSchuldversprecheninderKreditsicherung,
    title = "Das abstrakte Schuldversprechen in der Kreditsicherung",
    author = "Christina {Böttcher}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103603"
}