@book { UkrainistikinEuropa,
    title = "Ukrainistik in Europa",
    author = "Helmut {Schaller}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03245-1",
    url = "https://www.peterlang.com/document/1047107"
}