@book { BrsengangeinerFuballKapitalgesellschaft,
    title = "Börsengang einer Fußball-Kapitalgesellschaft",
    author = "Wolfgang {Lang}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832454524",
    url = "https://m.diplom.de/document/221004"
}