@article{ref1,
title="The concept of critical velocity: a brief analysis",
journal="European journal of applied physiology and occupational physiology",
year="1999",
author="Di Prampero, P. E.",
volume="80",
number="2",
pages="162-164",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0301-5548",
doi="",
url="http://dx.doi.org/"
}