@book { ZurFinanzierungvonKrankenundPflegeversicherung,
    title = "Zur Finanzierung von Kranken- und Pflegeversicherung",
    author = "Christian {Igel}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14118",
    url = "https://www.peterlang.com/document/1068641"
}