@book { Bluthochdrucknatrlichbehandeln,
    title = "Bluthochdruck natürlich behandeln",
    author = "Dr. Andrea {Flemmer}",
    year = "2023",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1026243"
}