@article{ref1,
title="Causes of blindness",
journal="Zdravookhranenie Rossiiskoi Federatsii",
year="1972",
author="Kovrov, Ia G.",
volume="16",
number="2",
pages="27-30",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0044-197X",
doi="",
url="http://dx.doi.org/"
}