@article{ref1,
title="Mental Ability and Its Relation to Physical Health and Social Economic Status",
journal="Psychol Clin",
year="1933",
author="Maller, J. B.",
volume="22",
number="2",
pages="101-107",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="",
doi="",
url="http://dx.doi.org/"
}