@article{ref1,
title="Acquisition of motor skill. IV. Effects of repeated periods of massed practice",
journal="Journal of experimental psychology",
year="1956",
author="Ammons, R. B. and Willig, L.",
volume="51",
number="2",
pages="118-126",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0022-1015",
doi="",
url="http://dx.doi.org/"
}