@article{ref1,
title="Activity, motor coordination and attention: individual differences in twins",
journal="Perceptual and motor skills",
year="1971",
author="Matheny, A. P. and Brown, A. M.",
volume="32",
number="1",
pages="151-158",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-5125",
doi="",
url="http://dx.doi.org/"
}