@article{ref1,
title="Incidence, form and social causes of behavior disorders in the preschool age",
journal="Monatsschrift fur Kinderheilkunde",
year="1974",
author="Hellbrugge, T. and Bartl, G. and Brack, U. and Wittrock, J. and Schuh, H.",
volume="122",
number="7",
pages="532-534",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0026-9298",
doi="",
url="http://dx.doi.org/"
}