@article{ref1,
title="Parent--offspring relations in man",
journal="Journal of reproduction and fertility",
year="1981",
author="Baum, J. D.",
volume="62",
number="2",
pages="651-656",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-4251",
doi="",
url="http://dx.doi.org/"
}