@article{ref1,
title="Piaget's concept of spatial egocentrism: a reevaluation",
journal="Scandinavian journal of psychology",
year="1971",
author="Kielgast, K.",
volume="12",
number="3",
pages="179-191",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0036-5564",
doi="",
url="http://dx.doi.org/"
}