@article{ref1,
title="A study of the medical causes of absence from duty aboard South African merchant ships",
journal="British journal of industrial medicine",
year="1972",
author="Levy, Suzanne",
volume="29",
number="2",
pages="196-200",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0007-1072",
doi="",
url="http://dx.doi.org/"
}