@book { FremdheitinderdeutschenSprache,
    title = "Fremdheit in der deutschen Sprache",
    author = "Shanshan {Liang} and Ulrich {Steinmüller}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13154",
    url = "https://www.peterlang.com/document/1055188"
}