@book { ClusterunddieNewEconomicGeography,
    title = "Cluster und die New Economic Geography",
    subtitle = "Theoretische Konzepte, empirische Tests und Konsequenzen für Regionalpolitik in Deutschland",
    author = "Timo {Litzenberger}",
    year = "2007",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101811"
}