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3. Tractor and implement stability on slopes;Spencer;Scottish Inst. Agric. Engng, Dept. Note SIN/193,1975
4. On the dynamic stability of tractors against overturning;Daskalov;Selskostop. Tekh.,1971
5. A hazard associated with the braking of two-wheel drive tractors on sloping land;Gilfillan;Scottish Inst. Agric. Engng, Dept. Note, SIN/180,1975