@book { ThefreemovementofpersonsbetweenSwitzerlandandtheEuropeanUnion,
    title = "The free movement of persons between Switzerland and the European Union",
    author = " {G. Giappichelli Editore s.r.l.}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-07101-6",
    url = "https://www.peterlang.com/document/1063734"
}