@book { DieFlukreuzschiffahrtaufderOder,
    title = "Die Flußkreuzschiffahrt auf der Oder",
    author = "Rainer {Deufert}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832419639",
    url = "https://m.diplom.de/document/217807"
}