@book { LeichterlebenmitEndometriose,
    title = "Leichter leben mit Endometriose",
    author = "Sabrina {Fricke-Piehl}",
    year = "2023",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1319872"
}