@book { ShouldIstayorshouldIgo,
    title = "Should I stay or should I go?",
    subtitle = "Die Wirkung nationalstaatlicher Grenzen auf die geografische Mobilität im europäischen Arbeitsmarkt",
    author = "Fritz {Heil}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832485993",
    url = "https://m.diplom.de/document/223793"
}