@article{ref1,
title="To change or not to change: is there a choice?",
journal="Virginia dental journal",
year="1990",
author="Wittemann, K. J.",
volume="67",
number="3",
pages="31-37",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0049-6472",
doi="",
url="http://dx.doi.org/"
}