@article{ref1,
title="Incidence of neuroses and neurotic syndromes in seamen and workers ashore with gastric and duodenal ulcer",
journal="Bulletin of the Institute of Maritime and Tropical Medicine in Gdynia",
year="1986",
author="Nitka, J.",
volume="37",
number="3-4",
pages="165-173",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0324-8542",
doi="",
url="http://dx.doi.org/"
}