@book { Hamburgisch,
    title = "Hamburgisch",
    author = "Andreas {Bieberstedt} and Jürgen {Ruge} and Ingrid {Schröder}",
    year = "2016",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-06713-2",
    url = "https://www.peterlang.com/document/1050253"
}