@book { PortfoliooptimierungmitHilfederAssetAllocation,
    title = "Portfoliooptimierung mit Hilfe der Asset-Allocation",
    author = "Stefan {Seegert}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297905"
}