@article{ref1,
title="Changes in physical activity from walking to school",
journal="Journal of nutrition education and behavior",
year="2008",
author="Sirard, John R. and Alhassan, Sofiya and Spencer, Tirzah R. and Robinson, Thomas N.",
volume="40",
number="5",
pages="324-326",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1499-4046",
doi="10.1016/j.jneb.2007.12.002",
url="http://dx.doi.org/10.1016/j.jneb.2007.12.002"
}