@article{ref1,
title="Electrical safety in hospitals--reduction of leakage current by use of a double screened mains transformer",
journal="Biomedical engineering (London)",
year="1974",
author="Pontoppidan, J. and Hansen, S.",
volume="9",
number="1",
pages="21-23",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0006-2898",
doi="",
url="http://dx.doi.org/"
}