@article{ref1,
title="Letter: Sustained visual afterimages",
journal="Vision research",
year="1974",
author="Magnussen, S. and Torjussen, T.",
volume="14",
number="8",
pages="743-744",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0042-6989",
doi="",
url="http://dx.doi.org/"
}