@book { RatgeberSchlaganfall,
    title = "Ratgeber Schlaganfall",
    author = "Dr. Eberhard J. {Wormer}",
    year = "2020",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/924925"
}