@book { ValuationmethodsofInternetstocks,
    title = "Valuation methods of Internet stocks",
    author = "Gunnar {Anger}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832426026",
    url = "https://m.diplom.de/document/218389"
}