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Tiw K.P., . and Kon K.F., . and Allard J.L., . (1994) Weed management in full and zero tillage in the tropics: comparative efficiency and weed dynamics. [Proceedings Paper]
Kon K.F., . and Robertson A.G., . (1984) Dual mutualistic associations in sainfoin Onobrychis viciifolia Scop. [Proceedings Paper]