@article{ref1,
title="Permission to die",
journal="BioScience",
year="1973",
author="Cassell, Eric J.",
volume="23",
number="8",
pages="475-478",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0006-3568",
doi="",
url="http://dx.doi.org/"
}