@article{ref1,
title="Backward and forward Crawford masking of multiple recognition stimuli",
journal="Acta psychologica",
year="1972",
author="Long, N. R.",
volume="36",
number="1",
pages="76-78",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6918",
doi="",
url="http://dx.doi.org/"
}