@book { DieLiberalisierungdesStrommarktesinEuropa,
    title = "Die Liberalisierung des Strommarktes in Europa",
    author = "Christian {Grütte}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832406790",
    url = "https://m.diplom.de/document/216607"
}