@article{ref1,
title="Perseveration and problem solving in infancy",
journal="Advances in child development and behavior",
year="1999",
author="Aguiar, A. and Baillargeon, R.",
volume="27",
number="",
pages="135-180",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0065-2407",
doi="",
url="http://dx.doi.org/"
}