@article{ref1,
title="Ammonia injuries in agriculture",
journal="Journal of the Iowa Medical Society",
year="1971",
author="Helmers, S. and Top, F. H. and Knapp, L. W.",
volume="61",
number="5",
pages="271-280",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-0587",
doi="",
url="http://dx.doi.org/"
}