@book { DerGesundheitskursArthrose,
    title = "Der Gesundheitskurs: Arthrose",
    author = "Sven {Bach} and Patrick {König} and Michael {König}",
    year = "2017",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403127"
}