@misc{Schefke_Tomasz_Improving,
 author={Schefke, Tomasz and Gronek, Piotr},
 copyright={Akademia Wychowania Fizycznego w Poznaniu},
 howpublished={online},
 publisher={Akademia Wychowania Fizycznego w Poznaniu},
 language={eng},
 type={artykuły},
 title={Improving attentional processes in sport; sport specific issues during effective playing time},
 keywords={attention, tennis, playing time},
}