@book { sterreichinEuropa,
    title = "Österreich in Europa",
    subtitle = "Eine Studie zur Transformation der nationalen Identität",
    author = "Christian {Pichler}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/223445"
}