@article{ref1,
title="Subgroups in the population of frequent users of inpatient services",
journal="Hospital and community psychiatry",
year="1990",
author="Casper, E. S. and Donaldson, B.",
volume="41",
number="2",
pages="189-191",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-1597",
doi="",
url="http://dx.doi.org/"
}