@book { DerVorrangderIndividualabrede,
    title = "Der Vorrang der Individualabrede",
    author = "Theresa {Bauerdick}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b19145",
    url = "https://www.peterlang.com/document/1148436"
}