@article{ref1,
title="Readability of dials at different distances with constant visual angle",
journal="Human factors",
year="1967",
author="Scarpa, L. C. and Chapanis, A.",
volume="9",
number="5",
pages="419-426",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}