1. Field performance of tractor draught control systems;Cowell;J agric. Engng Res.,1966
2. Automatic control of tractor mounted implements—an implement transfer function analyser;Cowell;J. agric. Engng Res.,1969
3. Experimental and simulated investigation of an electro-hydraulic plough control system;Hesse;Grundl. Landtech.,1968
4. The dynamic performance of tractor implement combinations;Dwyer,1969
5. The automatic control of tractor mounted implements;Cowell,1969