@article{ref1,
title="The Effect of Migrations upon Death-Rates",
journal="Journal of the Statistical Society of London",
year="1875",
author="Welton, Thomas A.",
volume="38",
number="3",
pages="324-343",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0959-5341",
doi="10.2307/2338770",
url="http://dx.doi.org/10.2307/2338770"
}