@article{ref1,
title="A target-changing device for rotary pursuit",
journal="Perceptual and motor skills",
year="1951",
author="Spiegel, Joseph and Crites, C. D.",
volume="3",
number="3",
pages="34-36",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0031-5125",
doi="10.2466/pms.1951.3.3.34",
url="http://dx.doi.org/10.2466/pms.1951.3.3.34"
}