@article{ref1,
title="Some empirically viable alternatives to random assignment",
journal="Journal of Policy Analysis and Management",
year="2009",
author="Cook, Thomas D. and Steiner, Peter M.",
volume="28",
number="1",
pages="165-166",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0276-8739",
doi="10.1002/pam.20408",
url="http://dx.doi.org/10.1002/pam.20408"
}