@article{ref1,
title="A microprocessor-based safe descent slope meter",
journal="Journal of agricultural engineering research",
year="1983",
author="Spencer, H. B. and Owen, G. M. and Greenhill, A. L.",
volume="28",
number="3",
pages="269-272",
abstract="Many tractor accidents on slopes occur when a tractor slides downhill out of control. This note describes a device which determines the critical slope at which such accidents will occur. The instrument also has an alarm system to warn the driver when the slope is near this value.<p /><p>Language: en</p>",
language="en",
issn="0021-8634",
doi="10.1016/0021-8634(83)90075-6",
url="http://dx.doi.org/10.1016/0021-8634(83)90075-6"
}