@book { SchicksalsmomentederSchachgeschichte,
    title = "Schicksalsmomente der Schachgeschichte",
    author = "Michael {Ehn} and Hugo {Kastner}",
    year = "2014",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403205"
}