@article{ref1,
title="Dangers of recreational helmet use in playgrounds",
journal="European journal of pediatrics",
year="1997",
author="Triebl, K. and Dittrich, Simone and Nores, H. and Mayr, J.",
volume="156",
number="11",
pages="895-895",
abstract="Abstract unavailable.",
language="",
issn="0340-6199",
doi="",
url="http://dx.doi.org/"
}