@article{ref1,
title="Spatial perceptions and play activities of nursery school children",
journal="Perceptual and motor skills",
year="1965",
author="Smith, O. W.",
volume="21",
number="1",
pages="260-260",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-5125",
doi="",
url="http://dx.doi.org/"
}