@book { RohstoffealsstrategischeAssetklasse,
    title = "Rohstoffe als strategische Assetklasse",
    author = "Manuel {Sternheimer}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/225082"
}