@book { KrafttrainingimSchwimmen,
    title = "Krafttraining im Schwimmen",
    author = "Robert {Mattes} and Christian {Dunke}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638489034",
    url = "https://m.hausarbeiten.de/document/53448"
}