@book { DieSagevonHeinrichdemLwenbeidenSlaven,
    title = "Die Sage von Heinrich dem Löwen bei den Slaven",
    author = "Winfried {Baumann}",
    year = "1975",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b13018",
    url = "https://www.peterlang.com/document/1066960"
}