@article{ref1,
title="Toward understanding the role of tasks in behavioral research",
journal="Acta psychologica",
year="1969",
author="Hackman, J. R.",
volume="31",
number="2",
pages="97-128",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6918",
doi="",
url="http://dx.doi.org/"
}