@article{ref1,
title="Physical principles in human co‐operation",
journal="Sociological review, The",
year="1952",
author="Daniel, Vera",
volume="a44",
number="1",
pages="107-134",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0038-0261",
doi="10.1111/j.1467-954X.1952.tb02498.x",
url="http://dx.doi.org/10.1111/j.1467-954X.1952.tb02498.x"
}