@book { AktienoptionsplnefrdasTopmanagement,
    title = "Aktienoptionspläne für das Topmanagement",
    subtitle = "Darstellung und Analyse",
    author = "Yvonne {Winkler}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832415556",
    url = "https://m.diplom.de/document/217397"
}