@book { Rckblick,
    title = "Rückblick",
    subtitle = "Nach Tagebuchnotizen aus den Jahren 1938 bis 1990",
    author = "Karl-Heinz {Günther}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093936"
}