@book { DieRiesenfallen,
    title = "Die Riesen fallen",
    author = "Ingvar {Ambjørnsen}",
    year = "2013",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    doi = "10.3239/9783942822626",
    url = "https://www.heypublishing.com/document/266369"
}