@book { DieTournamenttheorie,
    title = "Die Tournamenttheorie",
    author = "Gero {Debuschewitz}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832483302",
    url = "https://m.diplom.de/document/223523"
}