@book { RechtsfortbildungextralegemimArbeitsrecht,
    title = "Rechtsfortbildung extra legem im Arbeitsrecht",
    author = "Tilman {Meys}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107238"
}