@article{ref1,
title="Recommendations of the Polish Society of Sports Medicine on age criteria while qualifying children and youth for participation in various sports",
journal="British journal of sports medicine",
year="2012",
author="Kostka, Tomasz and Furgal, Witold and Gawronski, Wojciech and Bugajski, Andrzej and Czamara, Andrzej and Klukowski, Krzysztof and Krysztofiak, Hubert and Lewicki, Romuald and Szygula, Zbigniew and Tomaszewski, Wiesław and Trzaska, Tadeusz and Widuchowski, Jerzy and Ziemba, Andrzej Wojciech and Jegier, Anna",
volume="46",
number="3",
pages="159-162",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0306-3674",
doi="10.1136/bjsports-2011-090043",
url="http://dx.doi.org/10.1136/bjsports-2011-090043"
}