@article{ref1,
title="Health hazards associated with elevated levels of indoor radon--Pennsylvania",
journal="MMWR: Morbidity and mortality weekly report",
year="1985",
author="Centers for Disease Control and Prevention, USA, ",
volume="34",
number="43",
pages="657-658",
abstract="Abstract unavailable.",
language="en",
issn="0149-2195",
doi="",
url="http://dx.doi.org/"
}