@article{ref1,
title="Studies on the development of manual skill in children and youths",
journal="Zeitschrift für Kinderheilkunde",
year="1962",
author="Rutenfranz, J. and Hettinger, T. and Hellbruegge, T.",
volume="87",
number="",
pages="169-183",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0044-2917",
doi="",
url="http://dx.doi.org/"
}