@book { KmpfenimSportunterricht,
    title = "Kämpfen im Sportunterricht",
    author = "Jens {Malzer}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656554134",
    url = "https://www.hausarbeiten.de/document/265795"
}