@book { DerrussischdeutscheEuroperFedorAvgustoviStepun18841965,
    title = "Der russisch-deutsche Europäer: Fedor Avgustovič Stepun (1884–1965)",
    author = "Holger {Kuße} and Ludger {Udolph}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b12330",
    url = "https://www.peterlang.com/document/1110532"
}