@article{ref1,
title="Task predictability and the development of tracking skill under extended practice",
journal="Journal of experimental psychology",
year="1966",
author="Noble, M. and Trumbo, D. and Ulrich, L. and Cross, K.",
volume="72",
number="1",
pages="85-94",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-1015",
doi="",
url="http://dx.doi.org/"
}