@article{ref1,
title="Observations on the play of boxers",
journal="Psychotherapie, Medizinische Psychologie",
year="1965",
author="Ludwig, J.",
volume="22",
number="7",
pages="813-838",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0173-7937",
doi="",
url="http://dx.doi.org/"
}