@article{ref1,
title="Prevalence at death. I. A new method for deriving death rates for specific diseases",
journal="American journal of public health",
year="1968",
author="Markush, R. E. and Seigel, DG",
volume="58",
number="3",
pages="544-557",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}