@article{ref1,
title="Three comments received on farm tractor safety factors",
journal="American journal of public health",
year="1979",
author="Schnieder, R. D.",
volume="69",
number="8",
pages="823-824",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}