@book { HedgingStrategienmitCommodityFutures,
    title = "Hedging-Strategien mit Commodity-Futures",
    author = "Frank {Zerrenthin}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832438876",
    url = "https://m.diplom.de/document/219531"
}