@book { RulandinVersundProsa,
    title = "Rußland in Vers und Prosa",
    author = "Johannes {Holthusen}",
    year = "2012",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12203",
    url = "https://www.peterlang.com/document/1067450"
}