@article{ref1,
title="An experimental and ethological analysis of social reinforcement with retarded children",
journal="Child development",
year="1972",
author="Paris, S. G. and Cairns, R. B.",
volume="43",
number="3",
pages="717-729",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-3920",
doi="",
url="http://dx.doi.org/"
}