@article{ref1,
title="Evoked potential variability: effects of age, amplitude and methods of measurement",
journal="Electroencephalography and clinical neurophysiology",
year="1973",
author="Callaway, E. and Halliday, R. A.",
volume="34",
number="2",
pages="125-133",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0013-4694",
doi="",
url="http://dx.doi.org/"
}