@article{ref1,
title="Amount set and the length-difficulty function for a self-paced perceptual-motor skill",
journal="Journal of experimental psychology",
year="1953",
author="Noble, Clyde E.",
volume="46",
number="6",
pages="435-439",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0022-1015",
doi="",
url="http://dx.doi.org/"
}