@book { DasSchachSammelsurium,
    title = "Das Schach-Sammelsurium",
    subtitle = "Tag für Tag Anekdoten, Kurioses, Kalendarium, Biografien, Partien und Rekorde",
    author = "Hugo {Kastner}",
    year = "2011",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403224"
}