@article{ref1,
title="Accidents involving falls from roofs -- Survey and technical preventive measures",
journal="Journal of occupational accidents",
year="1984",
author="Axelsson, PO",
volume="6",
number="1-3",
pages="196-197",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0376-6349",
doi="",
url="http://dx.doi.org/"
}