@book { FormenkommunalerDemokratie,
    title = "Formen kommunaler Demokratie",
    author = "Lars {Holtkamp}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b11450",
    url = "https://www.peterlang.com/document/1055759"
}