@article{ref1,
title="Physiological and hygienic evaluation of the agricultural work of schoolchildren",
journal="Gigiena i Sanitariia",
year="1982",
author="Kalaĭkova, P. D. and Georgiev, V. I. and Semova, N. G. and Strashimirova, Ts M. and Nedeva, V. V.",
volume="",
number="3",
pages="61-63",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0016-9900",
doi="",
url="http://dx.doi.org/"
}