@article{ref1,
title="Biomechanics. The spring in the human foot",
journal="Nature",
year="1987",
author="McMahon, T. A.",
volume="325",
number="7000",
pages="108-109",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-0836",
doi="10.1038/325108a0",
url="http://dx.doi.org/10.1038/325108a0"
}