@article{ref1,
title="Bicycle helmets: effective protection",
journal="CMAJ : Canadian Medical Association journal",
year="1992",
author="Parkin, P. and Hu, X. and Spence, LaGena and Wesson, D.",
volume="147",
number="11",
pages="1631-1631",
abstract="Abstract unavailable.",
language="",
issn="0820-3946",
doi="",
url="http://dx.doi.org/"
}