@book { MarketingimliberalisiertenStrommarkt,
    title = "Marketing im liberalisierten Strommarkt",
    author = "Oliver C. {Lange} and Alexa {Veit} and Melanie {Merzenich}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832448776",
    url = "https://m.diplom.de/document/220446"
}