@article{ref1,
title="Guided practice in direct and reversed serial tracking",
journal="Ergonomics",
year="1965",
author="Macrae, A. W. and Holding, D. H.",
volume="8",
number="4",
pages="487-492",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}