@article{ref1,
title="Joy stick vs. Multiple levers for remote manipulator control",
journal="Human factors",
year="1964",
author="Crawford, B. M.",
volume="6",
number="",
pages="39-48",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}