@article{ref1,
title="A Report of the Examination of the Employees of the Pennsylvania Rail Road as to Color Sense, Acuteness of Vision, and Hearing",
journal="Transactions of the American Ophthalmological Society",
year="1884",
author="Thomson, W.",
volume="3",
number="",
pages="728-729",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0065-9533",
doi="",
url="http://dx.doi.org/"
}