@book { RulandunddiedeutschenExpressionisten19101925,
    title = "Rußland und die deutschen Expressionisten 1910 - 1925",
    author = "Valentin {Belentschikow}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1080916"
}