@article{ref1,
title="Spatial and temporal summation in the perception of lines",
journal="Vision research",
year="1976",
author="Vassilev, A. and Penchev, A.",
volume="16",
number="11",
pages="1329-1335",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0042-6989",
doi="",
url="http://dx.doi.org/"
}