@article{ref1,
title="Asphyxiation in street manholes",
journal="Public health reports (1896)",
year="1954",
author="Michaelsen, G. S. and Park, W. E.",
volume="69",
number="1",
pages="29-36",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0094-6214",
doi="",
url="http://dx.doi.org/"
}