@article{ref1,
title="Foreign bodies in the circulatory system",
journal="Nederlands Tijdschrift voor Geneeskunde",
year="1978",
author="van der Pol, J. M.",
volume="122",
number="44",
pages="1689-1692",
abstract="<p>[Abstract unavailable]</p><p>Language: nl</p>",
language="nl",
issn="0028-2162",
doi="",
url="http://dx.doi.org/"
}