@article{ref1,
title="Identification and Estimation of Local Average Treatment Effects",
journal="Econometrica",
year="1994",
author="Imbens, Gw and Angrist, Jd",
volume="62",
number="2",
pages="467-475",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0012-9682",
doi="10.2307/2951620",
url="http://dx.doi.org/10.2307/2951620"
}