@article{ref1,
title="Prediction-span, speed of response, smoothness, and accuracy in tracking",
journal="Perceptual and motor skills",
year="1956",
author="Gottsdanker, Robert M.",
volume="6",
number="2",
pages="171-181",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0031-5125",
doi="10.2466/pms.1956.6.h.171",
url="http://dx.doi.org/10.2466/pms.1956.6.h.171"
}