@book { FacettenderMehrsprachigkeitRefletsduplurilinguisme,
    title = "Facetten der Mehrsprachigkeit / Reflets du plurilinguisme",
    author = "Michael {Langner} and Vic {Jovanovic}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/b10384",
    url = "https://www.peterlang.com/document/1054469"
}