1. Polar diagram representation of tractor stability and control on slope;Gilfillan,1979
2. A hazard associated with the braking of two-wheel drive tractors on sloping land;Gilfillan,1975
3. Use of a weight transfer hitch to increase the critical direct descent slopes of a tractor with trailed equipment;Hunter;Int. J. Veh. Design,1981
4. Critical direct descent and ascent slopes of a tractor with forage harvest and trailer;Hunter;Int. J. Veh. Design,1981
5. Tractor accidents on slopes: a classroom model;Hunter,1981