@book { UnkonventionelleErdleNeueVariablenderglobalenErdlversorgung,
    title = "Unkonventionelle Erdöle. Neue Variablen der globalen Erdölversorgung",
    author = "Tim {Wirth}",
    year = "2014",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/275051"
}