@book { Vergeltetwieauchsievergalten,
    title = "Vergeltet, wie auch sie vergalten",
    author = "Frauke {Schuster}",
    year = "2013",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    doi = "10.3239/9783942822732",
    url = "https://www.heypublishing.com/document/262594"
}