@book { ShareholderValue,
    title = "Shareholder Value",
    author = "Klaus-Dieter {Lippmann}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832400248",
    url = "https://m.diplom.de/document/215983"
}