@book { CafeteriaModelle,
    title = "Cafeteria-Modelle",
    author = "Uta {Lichius}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832402884",
    url = "https://m.diplom.de/document/216274"
}