@article{ref1,
title="Variables in early discrimination learning: I. Motor responses in the training of a left-right discrimination",
journal="Child development",
year="1958",
author="Jeffrey, W. E.",
volume="29",
number="2",
pages="269-275",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-3920",
doi="",
url="http://dx.doi.org/"
}