@article{ref1,
title="Role of age constitution in work stress and recreation in children and adolescents",
journal="Deutsche Medizinische Wochenschrift",
year="1959",
author="Hellbrugge, T. and Rutenfranz, J.",
volume="84",
number="17",
pages="827-837",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0012-0472",
doi="",
url="http://dx.doi.org/"
}