@book { PrivateFinanzierungkommunalerInvestitionen,
    title = "Private Finanzierung kommunaler Investitionen",
    author = "Karen {Heppe}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1088666"
}