@book { VariationdurchSprachkontakt,
    title = "Variation durch Sprachkontakt",
    author = "François {Conrad}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b11397",
    url = "https://www.peterlang.com/document/1110183"
}