@article{ref1,
title="Prevention of Construction Operation Accidents: A Serious Duty for People",
journal="Zeitschrift des Vereines Deutscher Ingenieure",
year="1936",
author="Thorna, H",
volume="80",
number="",
pages="599-600",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0341-7255",
doi="",
url="http://dx.doi.org/"
}