@article{ref1,
title="Sensitization by annular surrounds: spatial summation properties",
journal="Vision research",
year="1970",
author="Teller, D. Y. and Matter, C. F. and Phillips, W. D.",
volume="10",
number="7",
pages="549-561",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0042-6989",
doi="",
url="http://dx.doi.org/"
}