@book { InterregionaleWohlstandsunterschiedeStandundEntwicklung,
    title = "Interregionale Wohlstandsunterschiede- Stand und Entwicklung",
    author = "Hans {Balmer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1070954"
}