@article{ref1,
title="Variability of the heart rhythm during mental work of varying intensity",
journal="Fiziologiia Cheloveka",
year="1986",
author="Demina, D. M. and Evlampieva, M. N. and Kandror, I. S. and Kirpichnikov, A. B. and Ratner, E. M.",
volume="12",
number="6",
pages="971-975",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0131-1646",
doi="",
url="http://dx.doi.org/"
}