@book { ChangesandChallengesofCrossborderMobilitywithintheEuropeanUnion,
    title = "Changes and Challenges of Cross-border Mobility within the European Union",
    author = "Trine {Lund Thomsen}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b17336",
    url = "https://www.peterlang.com/document/1111374"
}