@article{ref1,
title="Visual information obtained from flashes and from afterimages",
journal="Vision research",
year="1973",
author="Ditchburn, R. W. and Drysdale, A. E.",
volume="13",
number="12",
pages="2435-2447",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0042-6989",
doi="",
url="http://dx.doi.org/"
}