@article{ref1,
title="Racial and inter-racial differences in work capacity",
journal="Journal of biosocial science",
year="1969",
author="Andersen, K. L.",
volume="1",
number="Suppl 1",
pages="69-80",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9320",
doi="",
url="http://dx.doi.org/"
}