@book { MultilevelCitizenship,
    title = "Multilevel Citizenship",
    author = "Eva-Maria {Poptcheva}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/978-3-0352-6426-5",
    url = "https://www.peterlang.com/document/1053833"
}