@book { AgglomerationandRegionalUnemploymentDisparities,
    title = "Agglomeration and Regional Unemployment Disparities",
    subtitle = "A Theoretical Analysis with Reference to the European Union",
    author = "Jens {Südekum}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14155",
    url = "https://www.peterlang.com/document/1068650"
}