@book { FlexibleMechanismenimKyotoProtokoll,
    title = "Flexible Mechanismen im Kyoto-Protokoll",
    author = "Dirk {Schäfer}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832443399",
    url = "https://m.diplom.de/document/219951"
}