@misc{Bergier_Józef_Tendencies,
 author={Bergier, Józef and Bergier, Barbara},
 copyright={Akademia Wychowania Fizycznego w Poznaniu},
 howpublished={online},
 publisher={Akademia Wychowania Fizycznego w Poznaniu},
 language={eng},
 type={artykuł},
 title={Tendencies in endurance development among children and youth from eastern Poland},
}