@book { ImmigrationundIntegration,
    title = "Immigration und Integration",
    subtitle = "Völkerrechtliche und europarechtliche Antworten auf eine zentrale Herausforderung der Zeit",
    author = "Peter {Hilpold} and Christoph {Perathoner}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136036"
}