@article{ref1,
title="Difficulties in the perception and recognition of symbols used in a searching task",
journal="Activitas nervosa superior",
year="1970",
author="Chalupa, B. and Dornic, S.",
volume="12",
number="2",
pages="132-134",
abstract="<p>[Abstract unavailable]</p> <p>Language: cs</p>",
language="cs",
issn="0001-7604",
doi="",
url="http://dx.doi.org/"
}