@article{ref1,
title="TDM trends in the United States",
journal="IATSS research",
year="1998",
author="Orski, CK",
volume="22",
number="1",
pages="25-32",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}