@article{ref1,
title="Birth order, motor performance, and maternal influence",
journal="Research quarterly",
year="1977",
author="Alberts, C. L. and Landers, D. M.",
volume="48",
number="4",
pages="661-670",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0034-5377",
doi="",
url="http://dx.doi.org/"
}