@book { SchlafDasElixierdesLebens,
    title = "Schlaf - Das Elixier des Lebens",
    author = "Prof. Dr. med. Ulrich {Sommer} and Prof. Dr. med. Clemens {Heiser}",
    year = "2024",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1450354"
}