@article{ref1,
title="Increase of the dark adaptation by helenium and vitamin A emulsions",
journal="Albrecht von Graefe's Archiv für Ophthalmologie",
year="1953",
author="Studnitz, G. V.",
volume="154",
number="2",
pages="137-141",
abstract="<p>[Abstract unavailable]</p><p>Language: un</p>",
language="un",
issn="0376-0200",
doi="",
url="http://dx.doi.org/"
}