@article{ref1,
title="Modern motor milestones",
journal="Pediatrics",
year="1978",
author="Berger, L. R.",
volume="62",
number="6",
pages="1037-1038",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-4005",
doi="",
url="http://dx.doi.org/"
}