@article{ref1,
title="Perspective on the public good",
journal="American journal of public health",
year="1981",
author="Perkins, R. J.",
volume="71",
number="3",
pages="294-295",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}