@article{ref1,
title="Causes of morbidity in the district of Halle from the analytical and operational viewpoints",
journal="Zeitschrift fur die Gesamte Hygiene und Ihre Grenzgebiete",
year="1975",
author="Stenzel, G.",
volume="21",
number="6",
pages="470-474",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0049-8610",
doi="",
url="http://dx.doi.org/"
}