@article{ref1,
title="American immigration, fertility, and race suicide at the turn of the century",
journal="Journal of interdisciplinary history",
year="1990",
author="King, M. and Ruggles, S.",
volume="20",
number="3",
pages="347-369",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-1953",
doi="",
url="http://dx.doi.org/"
}