@book { HansKrsaBrundibr,
    title = "Hans Krása - Brundibár",
    subtitle = "Eine Kinderoper in Theresienstadt",
    author = "Ute {Martens}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832420338",
    url = "https://m.diplom.de/document/217464"
}