@article{ref1,
title="The role of fear in the motivation and acquisition of responses",
journal="Journal of experimental psychology",
year="1949",
author="Brown, Joel S. and Jacobs, Anne",
volume="39",
number="6",
pages="747-759",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-1015",
doi="",
url="http://dx.doi.org/"
}