@article{ref1,
title="The significance of limitation of visual fields and fields of fixation by spectacle frames and consequences for the production and fitting of spectacles",
journal="Klinische Monatsblätter für Augenheilkunde und für augenärztliche Fortbildung",
year="1961",
author="Hager, G.",
volume="139",
number="",
pages="543-553",
abstract="<p>[Abstract unavailable]</p> <p>Language: de</p>",
language="de",
issn="0344-6360",
doi="",
url="http://dx.doi.org/"
}