@book { ServicepublicundArt86Abs2EGV,
    title = "Service public und Art. 86 Abs. 2 EGV",
    author = "Jan {Keller}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1088639"
}