@article{ref1,
title="Encouraging group practice: with gun and net through the health establishment",
journal="American journal of public health",
year="1971",
author="Levin, P. J.",
volume="61",
number="5",
pages="949-956",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}