@book { BrgerlichesRechtfrStudiumundPraxisdigital,
    title = "Bürgerliches Recht für Studium und Praxis - digital",
    author = "Jos {Mehrings} and Christoph {Buchmüller} and Katrin {Patrzek} and Rainer {Herzog}",
    year = "2023",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1418783"
}