@book { HandelvonElektrizittanSpotundTerminmrkten,
    title = "Handel von Elektrizität an Spot- und Terminmärkten",
    author = "Jens Jürgen {Schwarz}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832422615",
    url = "https://m.diplom.de/document/218079"
}