@book { GeschichtedesRettungsdienstes19451990,
    title = "Geschichte des Rettungsdienstes 1945-1990",
    author = "Nils {Kessel}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105822"
}