@book { KommunaleFinanzkraft,
    title = "Kommunale Finanzkraft",
    author = "Ulrike {Hardt}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13821",
    url = "https://www.peterlang.com/document/1068396"
}