@book { RussischeBibliothekeninDeutschland,
    title = "Russische Bibliotheken in Deutschland",
    author = "Gottfried {Kratz}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16919",
    url = "https://www.peterlang.com/document/1058547"
}