@book { VorundNachteilevonrelativenLeistungsturnieren, title = "Vor- und Nachteile von relativen Leistungsturnieren", author = "Sabine {Lutz}", year = "2009", publisher = "Diplom.de", address = "Hamburg, Deutschland", doi = "10.3239/9783836630542", url = "https://m.diplom.de/document/226850" }