@article{ref1,
title="A statistical analysis of the accommodative-convergence gradient",
journal="American journal of optometry and archives of American Academy of Optometry",
year="1949",
author="Emmes, A. B.",
volume="26",
number="11",
pages="474-482",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9408",
doi="",
url="http://dx.doi.org/"
}