@article{ref1,
title="Fatalities attributed to methane asphyxia in manure waste pits--Ohio, Michigan, 1989",
journal="MMWR: Morbidity and mortality weekly report",
year="1989",
author="Centers for Disease Control and Prevention, USA, ",
volume="38",
number="33",
pages="583-586",
abstract="Abstract unavailable.",
language="en",
issn="0149-2195",
doi="",
url="http://dx.doi.org/"
}