@book { ZurkonomiepolitischerSysteme,
    title = "Zur Ökonomie politischer Systeme",
    author = "Heiko {Geruschkat}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13667",
    url = "https://www.peterlang.com/document/1068255"
}