@article{ref1,
title="Thresholds and resolution in human vision: a new approach to night vision testing",
journal="Human factors",
year="1974",
author="Shipley, T.",
volume="16",
number="1",
pages="56-64",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}