@misc{Naczk_Mariusz_The,
 author={Naczk, Mariusz and Żurek, Piotr and Brzenczek, Wioletta and Adach, Zdzisław},
 copyright={Akademia Wychowania Fizycznego w Poznaniu},
 howpublished={online},
 publisher={Akademia Wychowania Fizycznego w Poznaniu},
 language={eng},
 type={artykuł},
 title={The changes in anaerobic-phosphagenic efficiency occurring in middle-aged men at a five-year interval},
 keywords={anaerobic efficiency, force, velocity, middle-aged men},
}