@article{ref1,
title="Wheelchair design--technological and physiological aspects",
journal="Proceedings of the Royal Society of Medicine",
year="1974",
author="Engel, P. and Hildebrandt, G.",
volume="67",
number="5",
pages="409-413",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0035-9157",
doi="",
url="http://dx.doi.org/"
}