@book { PortugiesischalsDiasystemOPortuguscomoDiassistema,
    title = "Portugiesisch als Diasystem / O Português como Diassistema",
    author = "Aurelia {Merlan} and Jürgen {Schmidt-Radefeldt}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02802-7",
    url = "https://www.peterlang.com/document/1047505"
}