@article{ref1,
title="Trenching and elevated work: highs and lows of construction hazards",
journal="Occupational health and safety",
year="1987",
author="Polumbo, R. J.",
volume="56",
number="1",
pages="28, 32-4",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0362-4064",
doi="",
url="http://dx.doi.org/"
}