@book { AktuelleProblemedes263aStGB,
    title = "Aktuelle Probleme des  263a StGB",
    author = "Wulf {Müller}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1131680"
}