@book { IchhelfemirselbstArthrose,
    title = "Ich helfe mir selbst - Arthrose",
    author = "Dr. Andrea {Flemmer}",
    year = "2018",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/417467"
}