@book { ModerneSchnheitsMedizin,
    title = "Moderne Schönheits-Medizin",
    author = "Dr. med. Matthias {Koller}",
    year = "2022",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1275721"
}