@article{ref1,
title="Matching in retrospective studies; sampling via the dependent variable",
journal="Acta societatis medicorum Upsaliensis",
year="1968",
author="Taube, A.",
volume="73",
number="3-4",
pages="187-196",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6985",
doi="",
url="http://dx.doi.org/"
}