@book { ZurVitalittslavischerIdiomeinDeutschland,
    title = "Zur Vitalität slavischer Idiome in Deutschland",
    author = "Jörn {Achterberg}",
    year = "2005",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12748",
    url = "https://www.peterlang.com/document/1067142"
}