1. Research on Pneumatic Tyres for Farm Tractors;Hamblin,1945
2. The N.I.A.E. Single Wheel Tester;Bailey;N.I.A.E. Report No 40,1954
3. Experiments on Tractor Tyre Performance;Manby,1948
4. Field Measurement of Agricultural Tyre Performance at the N.I.A.E.;Dwyer,1972