Controlled seedbed traffic after ploughing or direct drilling under winter barley in Scotland, 1980–1984Donald J. Campbell, Robert Hunter, J.W. Dickson et al.|Soil and Tillage Research|1986Cited by 42
Effect of under-inflation of tractor tyres on seedbed compaction and winter barley establishment and yieldDonald J. Campbell, B.C. Ball, J.W. Dickson|Journal of Agricultural Engineering Research|1984Cited by 7