@book { StadtUmlandWanderungundFinanzwirtschaftderKernstdte,
    title = "Stadt-Umland-Wanderung und Finanzwirtschaft der Kernstädte",
    author = "Hans-Joachim {Conrad}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13788",
    url = "https://www.peterlang.com/document/1068365"
}