@book { HIVAidsinSdafrika,
    title = "HIV/Aids in Südafrika",
    author = "Claus {Arnhard}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832462543",
    url = "https://m.diplom.de/document/221474"
}