@article{ref1,
title="Statistical studies on the question of norm limits of the adult pneumoencephalogram. Problem of the norm in medicine",
journal="Fortschritte der Neurologie, Psychiatrie, und ihrer Grenzgebiete",
year="1973",
author="Vogel, T.",
volume="41",
number="2",
pages="55-122",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0015-8194",
doi="",
url="http://dx.doi.org/"
}