@book { LangzeitarbeitslosigkeitinderMetropolregionRheinNeckar,
    title = "Langzeitarbeitslosigkeit in der Metropolregion Rhein-Neckar",
    author = "Tobias {Hagen}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136317"
}