@book { FehlerAbweichungVariation,
    title = "Fehler – Abweichung – Variation",
    subtitle = "Sprachnormen aus linguistischer und didaktischer Sicht",
    author = "Christina {Ossenkop} and Georgia {Veldre-Gerner}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b17238",
    url = "https://www.peterlang.com/document/1111182"
}