@article{ref1,
title="Four-wheel drive tractors--a review",
journal="Journal of agricultural engineering research",
year="1985",
author="Rackham, D. H. and Blight, D. P.",
volume="31",
number="3",
pages="185-201",
abstract="This paper starts by tracing the history of four-wheel drive tractors up to the 1960s, when they became relatively commonplace. There are several different types of four-wheel drive tractor, the principal differentiating factor being the steering arrangement. These are summarized, together with the principal limitations of each type. There follows a review of work carried out in investigating the improved performance charateristics of four-wheel drive tractors. Consideration is given to the effect of four-wheel drive, and the consequent reduction in slip, on soil compaction. After reviewing the beneficial effect of four-wheel drive on tractor stability, the future role of four-wheel drive in tractor design is discussed. Current sales trends indicate that this role is increasing.<p /><p>Language: en</p>",
language="en",
issn="0021-8634",
doi="10.1016/0021-8634(85)90087-3",
url="http://dx.doi.org/10.1016/0021-8634(85)90087-3"
}