@book { DerconcursusduarumcausarumimklassischenrmischenRecht,
    title = "Der concursus duarum causarum im klassischen römischen Recht",
    author = "Susanne {Pfeil}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086614"
}