@book { WhydodemocraticstatesnotfighteachotherAsystemicapproachtothedemocraticpeace,
    title = "Why do democratic states not fight each other? A systemic approach to the democratic peace",
    author = "Simon {Oerding}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640299478",
    url = "https://www.hausarbeiten.de/document/124905"
}