@book { DieLiberalisierungdesErdgasmarktesinEuropa,
    title = "Die Liberalisierung des Erdgasmarktes in Europa",
    author = "Lars {Drecker}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832488437",
    url = "https://m.diplom.de/document/224021"
}