@article{ref1,
title="Physiological analysis of basic motor skills. I. Growth and development of jumping",
journal="American journal of physical medicine",
year="1961",
author="Hellebrandt, F. A. and Rarick, G. L. and Glassow, R. and Carns, M. L.",
volume="40",
number="",
pages="14-25",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9491",
doi="",
url="http://dx.doi.org/"
}