@article{ref1,
title="Some aspects of apparent motion",
journal="Acta psychologica",
year="1953",
author="Otto Roelofs, C. and Zeeman, W.P.C.",
volume="9",
number="",
pages="159-181",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0001-6918",
doi="10.1016/0001-6918(53)90010-9",
url="http://dx.doi.org/10.1016/0001-6918(53)90010-9"
}