@article{ref1,
title="Weight of the head in man--a biomechanical problem",
journal="Archiv fur Orthopadische und Unfall-Chirurgie",
year="1972",
author="Clemens, H. J.",
volume="73",
number="3",
pages="220-228",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0003-9330",
doi="",
url="http://dx.doi.org/"
}