@article{ref1,
title="The activity record: a measure of social isolation-involvement",
journal="Psychological reports",
year="1970",
author="Sachson, A. D. and Rappoport, L. and Sinnett, E. Robert",
volume="26",
number="2",
pages="413-414",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-2941",
doi="",
url="http://dx.doi.org/"
}