@article{ref1,
title="Reaction time to the second of two shortly spaced auditory signals both varying in intensity",
journal="Acta psychologica",
year="1972",
author="Keuss, P. J.",
volume="36",
number="3",
pages="226-238",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6918",
doi="",
url="http://dx.doi.org/"
}