@book { ClimateChangesandFossilFuel,
    title = "Climate Changes and Fossil Fuel",
    author = "Per {Kleinschmidt}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640243426",
    url = "https://www.hausarbeiten.de/document/120821"
}