@article{ref1,
title="Sequential task performance: task module relationships, reliabilities, and times",
journal="Human factors",
year="1974",
author="Mills, R. G. and Hatfield, S. A.",
volume="16",
number="2",
pages="117-128",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}