@book { DertransparenteMann,
    title = "Der transparente Mann",
    author = "Andrea {Sixt} and Barbara {Wilde}",
    year = "2013",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    doi = "10.3239/9783942822183",
    url = "https://www.heypublishing.com/document/208241"
}