@book { HabsburgunddieSlavia,
    title = "Habsburg und die Slavia",
    author = "Gun-Britt {Kohler} and Rainer {Grübel} and Hans Henning {Hahn}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104666"
}