@book { AusdenAugennichtausdemSinn,
    title = "Aus den Augen, nicht aus dem Sinn!",
    author = "Ursula {Kraus} and Frank {Waible}",
    year = "2021",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1221404"
}