@book { Aktienoptionsprogramme,
    title = "Aktienoptionsprogramme",
    author = "Jörg {Schaab}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836642309",
    url = "https://m.diplom.de/document/227587"
}