@article{ref1,
title="Time budget problem and labor expenditure in dentistry",
journal="Stomatologiia (Sofiia)",
year="1972",
author="Bajrakov, V.",
volume="54",
number="3",
pages="226-229",
abstract="<p>[Abstract unavailable]</p><p>Language: bg</p>",
language="bg",
issn="0491-0982",
doi="",
url="http://dx.doi.org/"
}