@book { EUEnlargement,
    title = "EU Enlargement",
    author = "Finn {Laursen}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/978-3-0352-6322-0",
    url = "https://www.peterlang.com/document/1053734"
}