@article{ref1,
title="Competitive sports in adolescence",
journal="Medicina Del Deporte y Del Trabajo",
year="1951",
author="Kral, J.",
volume="15",
number="98",
pages="4032-4034",
abstract="<p>[Abstract unavailable]</p> <p>Language: un</p>",
language="un",
issn="",
doi="",
url="http://dx.doi.org/"
}