@article{ref1,
title="Directional characteristics of behavioral change",
journal="Perceptual and motor skills",
year="1965",
author="Liu, I. M. and Chang, Su-Yu and Liu, P. Y. and Tang, M. Y.",
volume="20",
number="Suppl",
pages="1029-1032",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0031-5125",
doi="",
url="http://dx.doi.org/"
}