@book { DeutschinNorwegen,
    title = "Deutsch in Norwegen",
    subtitle = "Akten der nationalen Fachtagung in Oslo",
    author = "John Ole {Askedal} and Burkhard {Issel} and Otto Erlend {Nordgreen}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104854"
}