@article{ref1,
title="The proportional criterion in the evaluation of visual damage",
journal="Bollettino d'oculistica",
year="1960",
author="Redaelli, ",
volume="39",
number="",
pages="899-902",
abstract="<p>[Abstract unavailable]</p><p>Language: it</p>",
language="it",
issn="0006-677X",
doi="",
url="http://dx.doi.org/"
}