@book { DerAbschlusseinesAufhebungsvertrags,
    title = "Der Abschluss eines Aufhebungsvertrags",
    author = "Einiko B. {Franz}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101243"
}