@book { DieSternenscheibe,
    title = "Die Sternenscheibe",
    author = "Hildegard {Burri-Bayer}",
    year = "2012",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    doi = "10.3239/9783942822190",
    url = "https://www.heypublishing.com/document/206430"
}