@book { StaatenlexikonAfrika,
    title = "Staatenlexikon Afrika",
    author = "Wolfgang {Gieler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-06248-9",
    url = "https://www.peterlang.com/document/1054214"
}