@book { Berlin2039,
    title = "Berlin 2039",
    author = "Karsten {Krepinsky} and Ingo {Krepinsky} and Karin {Dufner}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1022346"
}