@article{ref1,
title="Porphyria due to drugs; preliminary report",
journal="Ugeskrift for Laeger",
year="1953",
author="Nielsen, E.",
volume="115",
number="44",
pages="1616-1618",
abstract="<p>[Abstract unavailable]</p><p>Language: un</p>",
language="un",
issn="0041-5782",
doi="",
url="http://dx.doi.org/"
}