@article{ref1,
title="Research With Firedamp and With Firedamp Protection of Electrical Drivers",
journal="Zeitschrift des Vereines Deutscher Ingenieure",
year="1906",
author="Hoffmann, H.",
volume="50",
number="",
pages="433-441",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0341-7255",
doi="",
url="http://dx.doi.org/"
}