1. A comparison of primary cultivation implements up to high speeds;Harrall;N.I.A.E. Dept. note no. DN/CU/732/1270,1976
2. The effect of speed on the performance of a tine; 1975/1976 field experiments;Stafford;N.I.A.E. Dept. note no. DN/T/774/05002,1977
3. Wear of flat cutting sweeps in relation to speed of movement and mechanical properties of the soil;Dovlatyan,1964
4. The wear of metal shares in agricultural soils;Richardson;Ph.D. thesis,1969
5. Abrasive wear of tillage implements;Singh,1972