@book { Brgerkriegsarmee,
    title = "Bürgerkriegsarmee",
    author = "Yves {Müller} and Reiner {Zilkenat}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03377-9",
    url = "https://www.peterlang.com/document/1046684"
}