@book { DerCO2MarktinderEU,
    title = "Der CO2-Markt in der EU",
    subtitle = "Eine industrieökonomische Analyse am Beispiel der Energiewirtschaft",
    author = "Momtchil {Michliachki}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836628457",
    url = "https://m.diplom.de/document/226721"
}