@article{ref1,
title="Results of strain tests with river vessel crews of the GDR over 24 hours of operation",
journal="Bulletin of the Institute of Maritime and Tropical Medicine in Gdynia",
year="1989",
author="Grimmer, G. and Franz, W. and Weber, T. and Kliese, S. and Stark, H. J. and Gathge, G.",
volume="40",
number="3-4",
pages="233-236",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0324-8542",
doi="",
url="http://dx.doi.org/"
}