@article{ref1,
title="Delayed motor development",
journal="Pediatric clinics of North America",
year="1968",
author="Illingworth, R. S.",
volume="15",
number="3",
pages="569-580",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-3955",
doi="",
url="http://dx.doi.org/"
}