@article{ref1,
title="The effect of instructions on the reported duration of a spiral after-effect",
journal="Acta psychologica",
year="1966",
author="Knowles, J. B. and Purves, C. and Oliver, J. E.",
volume="25",
number="1",
pages="94-100",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6918",
doi="",
url="http://dx.doi.org/"
}