@book { LuNikDezemberEinJahrspter,
    title = "Lu & Nik. Dezember. Ein Jahr später.",
    author = "A.D. {WiLK}",
    year = "2021",
    publisher = "adw",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1059917"
}