@book { CO2EmissionshandelinderHandelsperiode20082012,
    title = "CO2-Emissionshandel in der Handelsperiode 2008-2012",
    author = "Gunnar {Möller}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836609159",
    url = "https://m.diplom.de/document/225550"
}