@article{ref1,
title="Strong-willed and weak-willed children and adolescents",
journal="Praxis der Kinderpsychologie und Kinderpsychiatrie",
year="1964",
author="Valentiner, T.",
volume="13",
number="",
pages="181-186",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0032-7034",
doi="",
url="http://dx.doi.org/"
}