@article{ref1,
title="The origin of freemartin",
journal="Bulletin of the history of medicine",
year="1946",
author="Forbes, T. R.",
volume="20",
number="3",
pages="461-466",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-5140",
doi="",
url="http://dx.doi.org/"
}