@article{ref1,
title="Effect of pre-school education on selected indices of development in pupils from the 1st classes of elementary schools",
journal="Roczniki Panstwowego Zakladu Higieny",
year="1974",
author="Polus-Szeniawska, E.",
volume="25",
number="5",
pages="597-605",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0035-7715",
doi="",
url="http://dx.doi.org/"
}