@book { CodenameEinsteinRomannachTatsachen,
    title = "Codename Einstein - Roman nach Tatsachen",
    author = "Wolfhart {Willimczik}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640631889",
    url = "https://www.hausarbeiten.de/document/140074"
}