@book { TheBordersofSchengen,
    title = "The Borders of Schengen",
    author = "Alice {Cunha} and Marta {Silva} and Rui {Frederico}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/978-3-0352-6576-7",
    url = "https://www.peterlang.com/document/1053957"
}