@article{ref1,
title="Environmental factors in child mortality in England and Wales",
journal="American journal of epidemiology",
year="1971",
author="Collins, J. J. and Kasap, H. S. and Holland, W. W.",
volume="93",
number="1",
pages="10-22",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9262",
doi="",
url="http://dx.doi.org/"
}