@book { DieVertragsbernahme,
    title = "Die Vertragsübernahme",
    author = "Astrid {Schaffland}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01374-0",
    url = "https://www.peterlang.com/document/1047064"
}