@article{ref1,
title="On-target versus off-target information and the acquisition of tracking skill",
journal="Journal of experimental psychology",
year="1962",
author="Williams, Amanda C. de C. and Briggs, G. E.",
volume="64",
number="",
pages="519-525",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-1015",
doi="",
url="http://dx.doi.org/"
}