@article{ref1,
title="Carbon monoxide poisoning and pregnancy",
journal="Zentralblatt für Gynäkologie",
year="1952",
author="Seifert, P.",
volume="74",
number="23",
pages="895-900",
abstract="<p>[Abstract unavailable]</p><p>Language: un</p>",
language="un",
issn="0044-4197",
doi="",
url="http://dx.doi.org/"
}