@article{ref1,
title="Zürich ordinance concerning poisons",
journal="Praxis (Hallwag)",
year="1953",
author="Schwarz, F.",
volume="42",
number="21",
pages="421-424",
abstract="<p>[Abstract unavailable]</p> <p>Language: un</p>",
language="un",
issn="0369-8394",
doi="",
url="http://dx.doi.org/"
}