@article{ref1,
title="Managua--five seconds to tragedy",
journal="Florida dental journal",
year="1973",
author="Hehn, R. M.",
volume="44",
number="1",
pages="2-3",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0015-3990",
doi="",
url="http://dx.doi.org/"
}