@article{ref1,
title="NIOSH alert: request for assistance in preventing falls and electrocutions during tree trimming",
journal="MMWR: Morbidity and mortality weekly report",
year="1993",
author="Centers for Disease Control and Prevention, USA, ",
volume="42",
number="19",
pages="381-381",
abstract="Abstract unavailable.",
language="en",
issn="0149-2195",
doi="",
url="http://dx.doi.org/"
}