@article{ref1,
title="Study on the Variation Characteristics of the Geoelectric Field Preceding Earthquakes",
journal="Acta seismologica sinica. English edition",
year="2004",
author="Ma, QZ and Feng, ZS and Song, ZP and Zhao, WG",
volume="17",
number="3",
pages="334-",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1000-9116",
doi="",
url="http://dx.doi.org/"
}