@article{ref1,
title="Skill learning and performance. Postscript",
journal="Research quarterly",
year="1972",
author="Lersten, K. C. and Martens, R. and Smith, H. M.",
volume="43",
number="3",
pages="394-397",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0034-5377",
doi="",
url="http://dx.doi.org/"
}