@article{ref1,
title="Maternal mortality study. 1970-1975",
journal="New York state journal of medicine",
year="1976",
author="Hughes, E. C. and Cochrane, N. E. and Czyz, P. L.",
volume="76",
number="13",
pages="2206-2212",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-7628",
doi="",
url="http://dx.doi.org/"
}