@article{ref1,
title="Testing of visual acuity and space perception using a new sieve test",
journal="Bericht uber die Zusammenkunft - Deutsche Ophthalmologische Gesellschaft",
year="1978",
author="Toppel, L. and Reiner, J.",
volume="",
number="75",
pages="507-509",
abstract="<p>[Abstract unavailable]</p> <p>Language: de</p>",
language="de",
issn="0070-427X",
doi="",
url="http://dx.doi.org/"
}