@article{ref1,
title="A signal-detection evaluation of flat vs curved marker performance",
journal="Perceptual and motor skills",
year="1974",
author="Ladan, C. J. and Heron, R. M. and Nelson, Thomas M.",
volume="39",
number="1",
pages="355-358",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0031-5125",
doi="",
url="http://dx.doi.org/"
}